Merge remote-tracking branch 'upstream/master' into userreguserreg

1 files changed, 863 insertions, 168 deletions

diff --git a/src/nvim/drawscreen.c b/src/nvim/drawscreen.c
index 04c342e068..6cc623cb72 100644
--- a/src/nvim/drawscreen.c
+++ b/src/nvim/drawscreen.c
@@ -1,6 +1,3 @@
-// This is an open source non-commercial project. Dear PVS-Studio, please check
-// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
-
 // drawscreen.c: Code for updating all the windows on the screen.
 // This is the top level, drawline.c is the middle and grid.c/screen.c the lower level.
 
@@ -56,24 +53,32 @@
 
 #include <assert.h>
 #include <inttypes.h>
+#include <limits.h>
 #include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include "klib/kvec.h"
 #include "nvim/api/private/defs.h"
-#include "nvim/ascii.h"
+#include "nvim/ascii_defs.h"
 #include "nvim/autocmd.h"
 #include "nvim/buffer.h"
 #include "nvim/charset.h"
 #include "nvim/cmdexpand.h"
+#include "nvim/cursor.h"
 #include "nvim/decoration.h"
 #include "nvim/decoration_provider.h"
 #include "nvim/diff.h"
+#include "nvim/digraph.h"
 #include "nvim/drawline.h"
 #include "nvim/drawscreen.h"
+#include "nvim/eval.h"
 #include "nvim/ex_getln.h"
-#include "nvim/extmark_defs.h"
 #include "nvim/fold.h"
+#include "nvim/func_attr.h"
+#include "nvim/getchar.h"
+#include "nvim/gettext.h"
 #include "nvim/globals.h"
 #include "nvim/grid.h"
 #include "nvim/highlight.h"
@@ -86,20 +91,25 @@
 #include "nvim/move.h"
 #include "nvim/normal.h"
 #include "nvim/option.h"
+#include "nvim/option_vars.h"
 #include "nvim/plines.h"
 #include "nvim/popupmenu.h"
-#include "nvim/pos.h"
+#include "nvim/pos_defs.h"
 #include "nvim/profile.h"
 #include "nvim/regexp.h"
-#include "nvim/screen.h"
+#include "nvim/search.h"
+#include "nvim/sign_defs.h"
+#include "nvim/spell.h"
+#include "nvim/state.h"
 #include "nvim/statusline.h"
+#include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/terminal.h"
-#include "nvim/types.h"
+#include "nvim/types_defs.h"
 #include "nvim/ui.h"
 #include "nvim/ui_compositor.h"
 #include "nvim/version.h"
-#include "nvim/vim.h"
+#include "nvim/vim_defs.h"
 #include "nvim/window.h"
 
 /// corner value flags for hsep_connected and vsep_connected
@@ -118,8 +128,6 @@ static bool redraw_popupmenu = false;
 static bool msg_grid_invalid = false;
 static bool resizing_autocmd = false;
 
-static char *provider_err = NULL;
-
 /// Check if the cursor line needs to be redrawn because of 'concealcursor'.
 ///
 /// When cursor is moved at the same time, both lines will be redrawn regardless.
@@ -202,7 +210,7 @@ bool default_grid_alloc(void)
 
 void screenclear(void)
 {
-  check_for_delay(false);
+  msg_check_for_delay(false);
 
   if (starting == NO_SCREEN || default_grid.chars == NULL) {
     return;
@@ -212,7 +220,6 @@ void screenclear(void)
   for (int i = 0; i < default_grid.rows; i++) {
     grid_clear_line(&default_grid, default_grid.line_offset[i],
                     default_grid.cols, true);
-    default_grid.line_wraps[i] = false;
   }
 
   ui_call_grid_clear(1);  // clear the display
@@ -318,11 +325,15 @@ void screen_resize(int width, int height)
   resizing_autocmd = false;
   redraw_all_later(UPD_CLEAR);
 
+  if (State != MODE_ASKMORE && State != MODE_EXTERNCMD && State != MODE_CONFIRM) {
+    screenclear();
+  }
+
   if (starting != NO_SCREEN) {
     maketitle();
 
     changed_line_abv_curs();
-    invalidate_botline();
+    invalidate_botline(curwin);
 
     // We only redraw when it's needed:
     // - While at the more prompt or executing an external command, don't
@@ -370,6 +381,32 @@ void screen_resize(int width, int height)
   resizing_screen = false;
 }
 
+/// Check if the new Nvim application "screen" dimensions are valid.
+/// Correct it if it's too small or way too big.
+void check_screensize(void)
+{
+  // Limit Rows and Columns to avoid an overflow in Rows * Columns.
+  if (Rows < min_rows()) {
+    // need room for one window and command line
+    Rows = min_rows();
+  } else if (Rows > 1000) {
+    Rows = 1000;
+  }
+
+  if (Columns < MIN_COLUMNS) {
+    Columns = MIN_COLUMNS;
+  } else if (Columns > 10000) {
+    Columns = 10000;
+  }
+}
+
+/// Return true if redrawing should currently be done.
+bool redrawing(void)
+{
+  return !RedrawingDisabled
+         && !(p_lz && char_avail() && !KeyTyped && !do_redraw);
+}
+
 /// Redraw the parts of the screen that is marked for redraw.
 ///
 /// Most code shouldn't call this directly, rather use redraw_later() and
@@ -411,6 +448,15 @@ int update_screen(void)
   display_tick++;  // let syntax code know we're in a next round of
                    // display updating
 
+  // glyph cache full, very rare
+  if (schar_cache_clear_if_full()) {
+    // must use CLEAR, as the contents of screen buffers cannot be
+    // compared to their previous state here.
+    // TODO(bfredl): if start to cache schar_T values in places (like fcs/lcs)
+    // we need to revalidate these here as well!
+    type = MAX(type, UPD_CLEAR);
+  }
+
   // Tricky: vim code can reset msg_scrolled behind our back, so need
   // separate bookkeeping for now.
   if (msg_did_scroll) {
@@ -430,7 +476,7 @@ int update_screen(void)
       // non-displayed part of msg_grid is considered invalid.
       for (int i = 0; i < MIN(msg_scrollsize(), msg_grid.rows); i++) {
         grid_clear_line(&msg_grid, msg_grid.line_offset[i],
-                        msg_grid.cols, false);
+                        msg_grid.cols, i < p_ch);
       }
     }
     msg_grid.throttled = false;
@@ -507,7 +553,7 @@ int update_screen(void)
   ui_comp_set_screen_valid(true);
 
   DecorProviders providers;
-  decor_providers_start(&providers, &provider_err);
+  decor_providers_start(&providers);
 
   // "start" callback could have changed highlights for global elements
   if (win_check_ns_hl(NULL)) {
@@ -516,7 +562,7 @@ int update_screen(void)
   }
 
   if (clear_cmdline) {          // going to clear cmdline (done below)
-    check_for_delay(false);
+    msg_check_for_delay(false);
   }
 
   // Force redraw when width of 'number' or 'relativenumber' column
@@ -540,9 +586,9 @@ int update_screen(void)
     draw_tabline();
   }
 
-  // Correct stored syntax highlighting info for changes in each displayed
-  // buffer.  Each buffer must only be done once.
   FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
+    // Correct stored syntax highlighting info for changes in each displayed
+    // buffer.  Each buffer must only be done once.
     update_window_hl(wp, type >= UPD_NOT_VALID || hl_changed);
 
     buf_T *buf = wp->w_buffer;
@@ -554,10 +600,19 @@ int update_screen(void)
       }
 
       if (buf->b_mod_tick_decor < display_tick) {
-        decor_providers_invoke_buf(buf, &providers, &provider_err);
+        decor_providers_invoke_buf(buf, &providers);
         buf->b_mod_tick_decor = display_tick;
       }
     }
+
+    // Reset 'statuscolumn' if there is no dedicated signcolumn but it is invalid.
+    if (*wp->w_p_stc != NUL && wp->w_minscwidth <= SCL_NO
+        && (wp->w_buffer->b_signcols.invalid_bot || !wp->w_buffer->b_signcols.sentinel)) {
+      wp->w_nrwidth_line_count = 0;
+      wp->w_valid &= ~VALID_WCOL;
+      wp->w_redr_type = UPD_NOT_VALID;
+      wp->w_buffer->b_signcols.invalid_bot = 0;
+    }
   }
 
   // Go from top to bottom through the windows, redrawing the ones that need it.
@@ -624,7 +679,7 @@ int update_screen(void)
   }
   did_intro = true;
 
-  decor_providers_invoke_end(&providers, &provider_err);
+  decor_providers_invoke_end(&providers);
   kvi_destroy(providers);
 
   // either cmdline is cleared, not drawn or mode is last drawn
@@ -632,20 +687,56 @@ int update_screen(void)
   return OK;
 }
 
-static void win_border_redr_title(win_T *wp, ScreenGrid *grid, int col)
+/// Prepare for 'hlsearch' highlighting.
+void start_search_hl(void)
+{
+  if (!p_hls || no_hlsearch) {
+    return;
+  }
+
+  end_search_hl();  // just in case it wasn't called before
+  last_pat_prog(&screen_search_hl.rm);
+  // Set the time limit to 'redrawtime'.
+  screen_search_hl.tm = profile_setlimit(p_rdt);
+}
+
+/// Clean up for 'hlsearch' highlighting.
+void end_search_hl(void)
 {
-  VirtText title_chunks = wp->w_float_config.title_chunks;
+  if (screen_search_hl.rm.regprog == NULL) {
+    return;
+  }
 
-  for (size_t i = 0; i < title_chunks.size; i++) {
-    char *text = title_chunks.items[i].text;
-    int cell = (int)mb_string2cells(text);
-    int hl_id = title_chunks.items[i].hl_id;
-    int attr = hl_id ? syn_id2attr(hl_id) : 0;
-    grid_puts(grid, text, 0, col, attr);
-    col += cell;
+  vim_regfree(screen_search_hl.rm.regprog);
+  screen_search_hl.rm.regprog = NULL;
+}
+
+static void win_redr_bordertext(win_T *wp, VirtText vt, int col)
+{
+  for (size_t i = 0; i < kv_size(vt);) {
+    int attr = 0;
+    char *text = next_virt_text_chunk(vt, &i, &attr);
+    if (text == NULL) {
+      break;
+    }
+    attr = hl_apply_winblend(wp, attr);
+    col += grid_line_puts(col, text, -1, attr);
   }
 }
 
+int win_get_bordertext_col(int total_col, int text_width, AlignTextPos align)
+{
+  switch (align) {
+  case kAlignLeft:
+    return 1;
+  case kAlignCenter:
+    return MAX((total_col - text_width) / 2 + 1, 1);
+  case kAlignRight:
+    return MAX(total_col - text_width + 1, 1);
+  }
+  UNREACHABLE;
+}
+
 static void win_redr_border(win_T *wp)
 {
   wp->w_redr_border = false;
@@ -655,102 +746,459 @@ static void win_redr_border(win_T *wp)
 
   ScreenGrid *grid = &wp->w_grid_alloc;
 
-  schar_T *chars = wp->w_float_config.border_chars;
+  schar_T chars[8];
+  for (int i = 0; i < 8; i++) {
+    chars[i] = schar_from_str(wp->w_float_config.border_chars[i]);
+  }
   int *attrs = wp->w_float_config.border_attr;
 
   int *adj = wp->w_border_adj;
-  int irow = wp->w_height_inner + wp->w_winbar_height, icol = wp->w_width_inner;
+  int irow = wp->w_height_inner + wp->w_winbar_height;
+  int icol = wp->w_width_inner;
 
   if (adj[0]) {
-    grid_puts_line_start(grid, 0);
+    grid_line_start(grid, 0);
     if (adj[3]) {
-      grid_put_schar(grid, 0, 0, chars[0], attrs[0]);
+      grid_line_put_schar(0, chars[0], attrs[0]);
     }
 
     for (int i = 0; i < icol; i++) {
-      grid_put_schar(grid, 0, i + adj[3], chars[1], attrs[1]);
+      grid_line_put_schar(i + adj[3], chars[1], attrs[1]);
     }
 
     if (wp->w_float_config.title) {
-      int title_col = 0;
-      int title_width = wp->w_float_config.title_width;
-      AlignTextPos title_pos = wp->w_float_config.title_pos;
-
-      if (title_pos == kAlignCenter) {
-        title_col = (icol - title_width) / 2 + 1;
-      } else {
-        title_col = title_pos == kAlignLeft ? 1 : icol - title_width + 1;
-      }
-
-      win_border_redr_title(wp, grid, title_col);
+      int title_col = win_get_bordertext_col(icol, wp->w_float_config.title_width,
+                                             wp->w_float_config.title_pos);
+      win_redr_bordertext(wp, wp->w_float_config.title_chunks, title_col);
     }
     if (adj[1]) {
-      grid_put_schar(grid, 0, icol + adj[3], chars[2], attrs[2]);
+      grid_line_put_schar(icol + adj[3], chars[2], attrs[2]);
     }
-    grid_puts_line_flush(false);
+    grid_line_flush();
   }
 
   for (int i = 0; i < irow; i++) {
     if (adj[3]) {
-      grid_puts_line_start(grid, i + adj[0]);
-      grid_put_schar(grid, i + adj[0], 0, chars[7], attrs[7]);
-      grid_puts_line_flush(false);
+      grid_line_start(grid, i + adj[0]);
+      grid_line_put_schar(0, chars[7], attrs[7]);
+      grid_line_flush();
     }
     if (adj[1]) {
-      int ic = (i == 0 && !adj[0] && chars[2][0]) ? 2 : 3;
-      grid_puts_line_start(grid, i + adj[0]);
-      grid_put_schar(grid, i + adj[0], icol + adj[3], chars[ic], attrs[ic]);
-      grid_puts_line_flush(false);
+      int ic = (i == 0 && !adj[0] && chars[2]) ? 2 : 3;
+      grid_line_start(grid, i + adj[0]);
+      grid_line_put_schar(icol + adj[3], chars[ic], attrs[ic]);
+      grid_line_flush();
     }
   }
 
   if (adj[2]) {
-    grid_puts_line_start(grid, irow + adj[0]);
+    grid_line_start(grid, irow + adj[0]);
     if (adj[3]) {
-      grid_put_schar(grid, irow + adj[0], 0, chars[6], attrs[6]);
+      grid_line_put_schar(0, chars[6], attrs[6]);
     }
+
     for (int i = 0; i < icol; i++) {
-      int ic = (i == 0 && !adj[3] && chars[6][0]) ? 6 : 5;
-      grid_put_schar(grid, irow + adj[0], i + adj[3], chars[ic], attrs[ic]);
+      int ic = (i == 0 && !adj[3] && chars[6]) ? 6 : 5;
+      grid_line_put_schar(i + adj[3], chars[ic], attrs[ic]);
+    }
+
+    if (wp->w_float_config.footer) {
+      int footer_col = win_get_bordertext_col(icol, wp->w_float_config.footer_width,
+                                              wp->w_float_config.footer_pos);
+      win_redr_bordertext(wp, wp->w_float_config.footer_chunks, footer_col);
     }
     if (adj[1]) {
-      grid_put_schar(grid, irow + adj[0], icol + adj[3], chars[4], attrs[4]);
+      grid_line_put_schar(icol + adj[3], chars[4], attrs[4]);
+    }
+    grid_line_flush();
+  }
+}
+
+/// Set cursor to its position in the current window.
+void setcursor(void)
+{
+  setcursor_mayforce(false);
+}
+
+/// Set cursor to its position in the current window.
+/// @param force  when true, also when not redrawing.
+void setcursor_mayforce(bool force)
+{
+  if (force || redrawing()) {
+    validate_cursor();
+
+    ScreenGrid *grid = &curwin->w_grid;
+    int row = curwin->w_wrow;
+    int col = curwin->w_wcol;
+    if (curwin->w_p_rl) {
+      // With 'rightleft' set and the cursor on a double-wide character,
+      // position it on the leftmost column.
+      col = curwin->w_width_inner - curwin->w_wcol
+            - ((utf_ptr2cells(get_cursor_pos_ptr()) == 2
+                && vim_isprintc(gchar_cursor())) ? 2 : 1);
     }
-    grid_puts_line_flush(false);
+
+    grid_adjust(&grid, &row, &col);
+    ui_grid_cursor_goto(grid->handle, row, col);
   }
 }
 
 /// Show current cursor info in ruler and various other places
 ///
 /// @param always  if false, only show ruler if position has changed.
-void show_cursor_info(bool always)
+void show_cursor_info_later(bool force)
 {
-  if (!always && !redrawing()) {
-    return;
+  int state = get_real_state();
+  int empty_line = (State & MODE_INSERT) == 0
+                   && *ml_get_buf(curwin->w_buffer, curwin->w_cursor.lnum) == NUL;
+
+  // Only draw when something changed.
+  validate_virtcol_win(curwin);
+  if (force
+      || curwin->w_cursor.lnum != curwin->w_stl_cursor.lnum
+      || curwin->w_cursor.col != curwin->w_stl_cursor.col
+      || curwin->w_virtcol != curwin->w_stl_virtcol
+      || curwin->w_cursor.coladd != curwin->w_stl_cursor.coladd
+      || curwin->w_topline != curwin->w_stl_topline
+      || curwin->w_buffer->b_ml.ml_line_count != curwin->w_stl_line_count
+      || curwin->w_topfill != curwin->w_stl_topfill
+      || empty_line != curwin->w_stl_empty
+      || reg_recording != curwin->w_stl_recording
+      || state != curwin->w_stl_state
+      || (VIsual_active && VIsual_mode != curwin->w_stl_visual_mode)) {
+    if (curwin->w_status_height || global_stl_height()) {
+      curwin->w_redr_status = true;
+    } else {
+      redraw_cmdline = true;
+    }
+
+    if (*p_wbr != NUL || *curwin->w_p_wbr != NUL) {
+      curwin->w_redr_status = true;
+    }
+
+    if ((p_icon && (stl_syntax & STL_IN_ICON))
+        || (p_title && (stl_syntax & STL_IN_TITLE))) {
+      need_maketitle = true;
+    }
+  }
+
+  curwin->w_stl_cursor = curwin->w_cursor;
+  curwin->w_stl_virtcol = curwin->w_virtcol;
+  curwin->w_stl_empty = (char)empty_line;
+  curwin->w_stl_topline = curwin->w_topline;
+  curwin->w_stl_line_count = curwin->w_buffer->b_ml.ml_line_count;
+  curwin->w_stl_topfill = curwin->w_topfill;
+  curwin->w_stl_recording = reg_recording;
+  curwin->w_stl_state = state;
+  if (VIsual_active) {
+    curwin->w_stl_visual_mode = VIsual_mode;
   }
+}
+
+/// @return true when postponing displaying the mode message: when not redrawing
+/// or inside a mapping.
+bool skip_showmode(void)
+{
+  // Call char_avail() only when we are going to show something, because it
+  // takes a bit of time.  redrawing() may also call char_avail().
+  if (global_busy || msg_silent != 0 || !redrawing() || (char_avail() && !KeyTyped)) {
+    redraw_mode = true;  // show mode later
+    return true;
+  }
+  return false;
+}
+
+/// Show the current mode and ruler.
+///
+/// If clear_cmdline is true, clear the rest of the cmdline.
+/// If clear_cmdline is false there may be a message there that needs to be
+/// cleared only if a mode is shown.
+/// If redraw_mode is true show or clear the mode.
+/// @return the length of the message (0 if no message).
+int showmode(void)
+{
+  int length = 0;
+
+  if (ui_has(kUIMessages) && clear_cmdline) {
+    msg_ext_clear(true);
+  }
+
+  // don't make non-flushed message part of the showmode
+  msg_ext_ui_flush();
+
+  msg_grid_validate();
+
+  int do_mode = ((p_smd && msg_silent == 0)
+                 && ((State & MODE_TERMINAL)
+                     || (State & MODE_INSERT)
+                     || restart_edit != NUL
+                     || VIsual_active));
+
+  bool can_show_mode = (p_ch != 0 || ui_has(kUIMessages));
+  if ((do_mode || reg_recording != 0) && can_show_mode) {
+    int sub_attr;
+    if (skip_showmode()) {
+      return 0;  // show mode later
+    }
+
+    bool nwr_save = need_wait_return;
+
+    // wait a bit before overwriting an important message
+    msg_check_for_delay(false);
+
+    // if the cmdline is more than one line high, erase top lines
+    bool need_clear = clear_cmdline;
+    if (clear_cmdline && cmdline_row < Rows - 1) {
+      msg_clr_cmdline();  // will reset clear_cmdline
+    }
+
+    // Position on the last line in the window, column 0
+    msg_pos_mode();
+    int attr = HL_ATTR(HLF_CM);                     // Highlight mode
+
+    // When the screen is too narrow to show the entire mode message,
+    // avoid scrolling and truncate instead.
+    msg_no_more = true;
+    int save_lines_left = lines_left;
+    lines_left = 0;
+
+    if (do_mode) {
+      msg_puts_attr("--", attr);
+      // CTRL-X in Insert mode
+      if (edit_submode != NULL && !shortmess(SHM_COMPLETIONMENU)) {
+        // These messages can get long, avoid a wrap in a narrow window.
+        // Prefer showing edit_submode_extra. With external messages there
+        // is no imposed limit.
+        if (ui_has(kUIMessages)) {
+          length = INT_MAX;
+        } else {
+          length = (Rows - msg_row) * Columns - 3;
+        }
+        if (edit_submode_extra != NULL) {
+          length -= vim_strsize(edit_submode_extra);
+        }
+        if (length > 0) {
+          if (edit_submode_pre != NULL) {
+            length -= vim_strsize(edit_submode_pre);
+          }
+          if (length - vim_strsize(edit_submode) > 0) {
+            if (edit_submode_pre != NULL) {
+              msg_puts_attr(edit_submode_pre, attr);
+            }
+            msg_puts_attr(edit_submode, attr);
+          }
+          if (edit_submode_extra != NULL) {
+            msg_puts_attr(" ", attr);  // Add a space in between.
+            if ((int)edit_submode_highl < HLF_COUNT) {
+              sub_attr = win_hl_attr(curwin, (int)edit_submode_highl);
+            } else {
+              sub_attr = attr;
+            }
+            msg_puts_attr(edit_submode_extra, sub_attr);
+          }
+        }
+      } else {
+        if (State & MODE_TERMINAL) {
+          msg_puts_attr(_(" TERMINAL"), attr);
+        } else if (State & VREPLACE_FLAG) {
+          msg_puts_attr(_(" VREPLACE"), attr);
+        } else if (State & REPLACE_FLAG) {
+          msg_puts_attr(_(" REPLACE"), attr);
+        } else if (State & MODE_INSERT) {
+          if (p_ri) {
+            msg_puts_attr(_(" REVERSE"), attr);
+          }
+          msg_puts_attr(_(" INSERT"), attr);
+        } else if (restart_edit == 'I' || restart_edit == 'i'
+                   || restart_edit == 'a' || restart_edit == 'A') {
+          if (curbuf->terminal) {
+            msg_puts_attr(_(" (terminal)"), attr);
+          } else {
+            msg_puts_attr(_(" (insert)"), attr);
+          }
+        } else if (restart_edit == 'R') {
+          msg_puts_attr(_(" (replace)"), attr);
+        } else if (restart_edit == 'V') {
+          msg_puts_attr(_(" (vreplace)"), attr);
+        }
+        if (State & MODE_LANGMAP) {
+          if (curwin->w_p_arab) {
+            msg_puts_attr(_(" Arabic"), attr);
+          } else if (get_keymap_str(curwin, " (%s)",
+                                    NameBuff, MAXPATHL)) {
+            msg_puts_attr(NameBuff, attr);
+          }
+        }
+        if ((State & MODE_INSERT) && p_paste) {
+          msg_puts_attr(_(" (paste)"), attr);
+        }
+
+        if (VIsual_active) {
+          char *p;
+
+          // Don't concatenate separate words to avoid translation
+          // problems.
+          switch ((VIsual_select ? 4 : 0)
+                  + (VIsual_mode == Ctrl_V) * 2
+                  + (VIsual_mode == 'V')) {
+          case 0:
+            p = N_(" VISUAL"); break;
+          case 1:
+            p = N_(" VISUAL LINE"); break;
+          case 2:
+            p = N_(" VISUAL BLOCK"); break;
+          case 4:
+            p = N_(" SELECT"); break;
+          case 5:
+            p = N_(" SELECT LINE"); break;
+          default:
+            p = N_(" SELECT BLOCK"); break;
+          }
+          msg_puts_attr(_(p), attr);
+        }
+        msg_puts_attr(" --", attr);
+      }
+
+      need_clear = true;
+    }
+    if (reg_recording != 0
+        && edit_submode == NULL             // otherwise it gets too long
+        ) {
+      recording_mode(attr);
+      need_clear = true;
+    }
+
+    mode_displayed = true;
+    if (need_clear || clear_cmdline || redraw_mode) {
+      msg_clr_eos();
+    }
+    msg_didout = false;                 // overwrite this message
+    length = msg_col;
+    msg_col = 0;
+    msg_no_more = false;
+    lines_left = save_lines_left;
+    need_wait_return = nwr_save;        // never ask for hit-return for this
+  } else if (clear_cmdline && msg_silent == 0) {
+    // Clear the whole command line.  Will reset "clear_cmdline".
+    msg_clr_cmdline();
+  } else if (redraw_mode) {
+    msg_pos_mode();
+    msg_clr_eos();
+  }
+
+  // NB: also handles clearing the showmode if it was empty or disabled
+  msg_ext_flush_showmode();
+
+  // In Visual mode the size of the selected area must be redrawn.
+  if (VIsual_active) {
+    clear_showcmd();
+  }
+
+  // If the current or last window has no status line and global statusline is disabled,
+  // the ruler is after the mode message and must be redrawn
+  win_T *ruler_win = curwin->w_status_height == 0 ? curwin : lastwin_nofloating();
+  if (redrawing() && ruler_win->w_status_height == 0 && global_stl_height() == 0
+      && !(p_ch == 0 && !ui_has(kUIMessages))) {
+    grid_line_start(&msg_grid_adj, Rows - 1);
+    win_redr_ruler(ruler_win);
+    grid_line_flush();
+  }
+
+  redraw_cmdline = false;
+  redraw_mode = false;
+  clear_cmdline = false;
+
+  return length;
+}
+
+/// Position for a mode message.
+static void msg_pos_mode(void)
+{
+  msg_col = 0;
+  msg_row = Rows - 1;
+}
 
-  win_check_ns_hl(curwin);
-  if ((*p_stl != NUL || *curwin->w_p_stl != NUL)
-      && (curwin->w_status_height || global_stl_height())) {
-    redraw_custom_statusline(curwin);
+/// Delete mode message.  Used when ESC is typed which is expected to end
+/// Insert mode (but Insert mode didn't end yet!).
+/// Caller should check "mode_displayed".
+void unshowmode(bool force)
+{
+  // Don't delete it right now, when not redrawing or inside a mapping.
+  if (!redrawing() || (!force && char_avail() && !KeyTyped)) {
+    redraw_cmdline = true;  // delete mode later
   } else {
-    win_redr_ruler(curwin, always);
+    clearmode();
   }
-  if (*p_wbr != NUL || *curwin->w_p_wbr != NUL) {
-    win_redr_winbar(curwin);
+}
+
+// Clear the mode message.
+void clearmode(void)
+{
+  const int save_msg_row = msg_row;
+  const int save_msg_col = msg_col;
+
+  msg_ext_ui_flush();
+  msg_pos_mode();
+  if (reg_recording != 0) {
+    recording_mode(HL_ATTR(HLF_CM));
   }
+  msg_clr_eos();
+  msg_ext_flush_showmode();
 
-  if (need_maketitle
-      || (p_icon && (stl_syntax & STL_IN_ICON))
-      || (p_title && (stl_syntax & STL_IN_TITLE))) {
-    maketitle();
+  msg_col = save_msg_col;
+  msg_row = save_msg_row;
+}
+
+static void recording_mode(int attr)
+{
+  msg_puts_attr(_("recording"), attr);
+  if (shortmess(SHM_RECORDING)) {
+    return;
   }
 
-  win_check_ns_hl(NULL);
-  // Redraw the tab pages line if needed.
-  if (redraw_tabline) {
-    draw_tabline();
+  char s[4];
+  snprintf(s, ARRAY_SIZE(s), " @%c", reg_recording);
+  msg_puts_attr(s, attr);
+}
+
+#define COL_RULER 17        // columns needed by standard ruler
+
+/// Compute columns for ruler and shown command. 'sc_col' is also used to
+/// decide what the maximum length of a message on the status line can be.
+/// If there is a status line for the last window, 'sc_col' is independent
+/// of 'ru_col'.
+void comp_col(void)
+{
+  bool last_has_status = last_stl_height(false) > 0;
+
+  sc_col = 0;
+  ru_col = 0;
+  if (p_ru) {
+    ru_col = (ru_wid ? ru_wid : COL_RULER) + 1;
+    // no last status line, adjust sc_col
+    if (!last_has_status) {
+      sc_col = ru_col;
+    }
+  }
+  if (p_sc) {
+    sc_col += SHOWCMD_COLS;
+    if (!p_ru || last_has_status) {         // no need for separating space
+      sc_col++;
+    }
+  }
+  assert(sc_col >= 0
+         && INT_MIN + sc_col <= Columns);
+  sc_col = Columns - sc_col;
+  assert(ru_col >= 0
+         && INT_MIN + ru_col <= Columns);
+  ru_col = Columns - ru_col;
+  if (sc_col <= 0) {            // screen too narrow, will become a mess
+    sc_col = 1;
   }
+  if (ru_col <= 0) {
+    ru_col = 1;
+  }
+  set_vim_var_nr(VV_ECHOSPACE, sc_col - 1);
 }
 
 static void redraw_win_signcol(win_T *wp)
@@ -762,6 +1210,7 @@ static void redraw_win_signcol(win_T *wp)
   wp->w_scwidth = win_signcol_count(wp);
   if (wp->w_scwidth != scwidth) {
     changed_line_abv_curs_win(wp);
+    redraw_later(wp, UPD_NOT_VALID);
   }
 }
 
@@ -844,8 +1293,8 @@ static void draw_vsep_win(win_T *wp)
   }
 
   // draw the vertical separator right of this window
-  int hl;
-  int c = fillchar_vsep(wp, &hl);
+  int hl = win_hl_attr(wp, HLF_C);
+  int c = wp->w_p_fcs_chars.vert;
   grid_fill(&default_grid, wp->w_winrow, W_ENDROW(wp),
             W_ENDCOL(wp), W_ENDCOL(wp) + 1, c, ' ', hl);
 }
@@ -858,30 +1307,32 @@ static void draw_hsep_win(win_T *wp)
   }
 
   // draw the horizontal separator below this window
-  int hl;
-  int c = fillchar_hsep(wp, &hl);
+  int hl = win_hl_attr(wp, HLF_C);
+  int c = wp->w_p_fcs_chars.horiz;
   grid_fill(&default_grid, W_ENDROW(wp), W_ENDROW(wp) + 1,
             wp->w_wincol, W_ENDCOL(wp), c, c, hl);
 }
 
 /// Get the separator connector for specified window corner of window "wp"
-static int get_corner_sep_connector(win_T *wp, WindowCorner corner)
+static schar_T get_corner_sep_connector(win_T *wp, WindowCorner corner)
 {
   // It's impossible for windows to be connected neither vertically nor horizontally
   // So if they're not vertically connected, assume they're horizontally connected
+  int c;
   if (vsep_connected(wp, corner)) {
     if (hsep_connected(wp, corner)) {
-      return wp->w_p_fcs_chars.verthoriz;
+      c = wp->w_p_fcs_chars.verthoriz;
     } else if (corner == WC_TOP_LEFT || corner == WC_BOTTOM_LEFT) {
-      return wp->w_p_fcs_chars.vertright;
+      c = wp->w_p_fcs_chars.vertright;
     } else {
-      return wp->w_p_fcs_chars.vertleft;
+      c = wp->w_p_fcs_chars.vertleft;
     }
   } else if (corner == WC_TOP_LEFT || corner == WC_TOP_RIGHT) {
-    return wp->w_p_fcs_chars.horizdown;
+    c = wp->w_p_fcs_chars.horizdown;
   } else {
-    return wp->w_p_fcs_chars.horizup;
+    c = wp->w_p_fcs_chars.horizup;
   }
+  return schar_from_char(c);
 }
 
 /// Draw separator connecting characters on the corners of window "wp"
@@ -917,21 +1368,31 @@ static void draw_sep_connectors_win(win_T *wp)
   win_at_left = frp->fr_parent == NULL;
 
   // Draw the appropriate separator connector in every corner where drawing them is necessary
-  if (!(win_at_top || win_at_left)) {
-    grid_putchar(&default_grid, get_corner_sep_connector(wp, WC_TOP_LEFT),
-                 wp->w_winrow - 1, wp->w_wincol - 1, hl);
-  }
-  if (!(win_at_top || win_at_right)) {
-    grid_putchar(&default_grid, get_corner_sep_connector(wp, WC_TOP_RIGHT),
-                 wp->w_winrow - 1, W_ENDCOL(wp), hl);
-  }
-  if (!(win_at_bottom || win_at_left)) {
-    grid_putchar(&default_grid, get_corner_sep_connector(wp, WC_BOTTOM_LEFT),
-                 W_ENDROW(wp), wp->w_wincol - 1, hl);
-  }
-  if (!(win_at_bottom || win_at_right)) {
-    grid_putchar(&default_grid, get_corner_sep_connector(wp, WC_BOTTOM_RIGHT),
-                 W_ENDROW(wp), W_ENDCOL(wp), hl);
+  // Make sure not to send cursor position updates to ui.
+  bool top_left = !(win_at_top || win_at_left);
+  bool top_right = !(win_at_top || win_at_right);
+  bool bot_left = !(win_at_bottom || win_at_left);
+  bool bot_right = !(win_at_bottom || win_at_right);
+
+  if (top_left) {
+    grid_line_start(&default_grid, wp->w_winrow - 1);
+    grid_line_put_schar(wp->w_wincol - 1, get_corner_sep_connector(wp, WC_TOP_LEFT), hl);
+    grid_line_flush();
+  }
+  if (top_right) {
+    grid_line_start(&default_grid, wp->w_winrow - 1);
+    grid_line_put_schar(W_ENDCOL(wp), get_corner_sep_connector(wp, WC_TOP_RIGHT), hl);
+    grid_line_flush();
+  }
+  if (bot_left) {
+    grid_line_start(&default_grid, W_ENDROW(wp));
+    grid_line_put_schar(wp->w_wincol - 1, get_corner_sep_connector(wp, WC_BOTTOM_LEFT), hl);
+    grid_line_flush();
+  }
+  if (bot_right) {
+    grid_line_start(&default_grid, W_ENDROW(wp));
+    grid_line_put_schar(W_ENDCOL(wp), get_corner_sep_connector(wp, WC_BOTTOM_RIGHT), hl);
+    grid_line_flush();
   }
 }
 
@@ -992,9 +1453,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
   int type = wp->w_redr_type;
 
   if (type >= UPD_NOT_VALID) {
-    // TODO(bfredl): should only be implied for CLEAR, not NOT_VALID!
     wp->w_redr_status = true;
-
     wp->w_lines_valid = 0;
   }
 
@@ -1027,25 +1486,41 @@ static void win_update(win_T *wp, DecorProviders *providers)
 
   win_extmark_arr.size = 0;
 
-  decor_redraw_reset(buf, &decor_state);
+  decor_redraw_reset(wp, &decor_state);
 
   DecorProviders line_providers;
-  decor_providers_invoke_win(wp, providers, &line_providers, &provider_err);
+  decor_providers_invoke_win(wp, providers, &line_providers);
 
   redraw_win_signcol(wp);
 
   init_search_hl(wp, &screen_search_hl);
 
-  // Force redraw when width of 'number' or 'relativenumber' column
-  // changes.
-  int nrwidth = (wp->w_p_nu || wp->w_p_rnu || *wp->w_p_stc) ? number_width(wp) : 0;
-  if (wp->w_nrwidth != nrwidth) {
-    type = UPD_NOT_VALID;
-    wp->w_nrwidth = nrwidth;
-
-    if (buf->terminal) {
-      terminal_check_size(buf->terminal);
+  // Make sure skipcol is valid, it depends on various options and the window
+  // width.
+  if (wp->w_skipcol > 0) {
+    int w = 0;
+    int width1 = wp->w_width_inner - win_col_off(wp);
+    int width2 = width1 + win_col_off2(wp);
+    int add = width1;
+
+    while (w < wp->w_skipcol) {
+      if (w > 0) {
+        add = width2;
+      }
+      w += add;
+    }
+    if (w != wp->w_skipcol) {
+      // always round down, the higher value may not be valid
+      wp->w_skipcol = w - add;
     }
+  }
+
+  const int nrwidth_before = wp->w_nrwidth;
+  int nrwidth_new = (wp->w_p_nu || wp->w_p_rnu || *wp->w_p_stc) ? number_width(wp) : 0;
+  // Force redraw when width of 'number' or 'relativenumber' column changes.
+  if (wp->w_nrwidth != nrwidth_new) {
+    type = UPD_NOT_VALID;
+    wp->w_nrwidth = nrwidth_new;
   } else if (buf->b_mod_set
              && buf->b_mod_xlines != 0
              && wp->w_redraw_top != 0) {
@@ -1099,8 +1574,6 @@ static void win_update(win_T *wp, DecorProviders *providers)
       }
     }
     if (mod_top != 0 && hasAnyFolding(wp)) {
-      linenr_T lnumt, lnumb;
-
       // A change in a line can cause lines above it to become folded or
       // unfolded.  Find the top most buffer line that may be affected.
       // If the line was previously folded and displayed, get the first
@@ -1111,8 +1584,8 @@ static void win_update(win_T *wp, DecorProviders *providers)
       // the line below it.  If there is no valid entry, use w_topline.
       // Find the first valid w_lines[] entry below mod_bot.  Set lnumb
       // to this line.  If there is no valid entry, use MAXLNUM.
-      lnumt = wp->w_topline;
-      lnumb = MAXLNUM;
+      linenr_T lnumt = wp->w_topline;
+      linenr_T lnumb = MAXLNUM;
       for (int i = 0; i < wp->w_lines_valid; i++) {
         if (wp->w_lines[i].wl_valid) {
           if (wp->w_lines[i].wl_lastlnum < mod_top) {
@@ -1168,11 +1641,11 @@ static void win_update(win_T *wp, DecorProviders *providers)
   // When only displaying the lines at the top, set top_end.  Used when
   // window has scrolled down for msg_scrolled.
   if (type == UPD_REDRAW_TOP) {
-    long j = 0;
+    int j = 0;
     for (int i = 0; i < wp->w_lines_valid; i++) {
       j += wp->w_lines[i].wl_size;
       if (j >= wp->w_upd_rows) {
-        top_end = (int)j;
+        top_end = j;
         break;
       }
     }
@@ -1205,7 +1678,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
                    || (wp->w_topline == wp->w_lines[0].wl_lnum
                        && wp->w_topfill > wp->w_old_topfill))) {
       // New topline is above old topline: May scroll down.
-      long j;
+      int j;
       if (hasAnyFolding(wp)) {
         linenr_T ln;
 
@@ -1223,7 +1696,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
         j = wp->w_lines[0].wl_lnum - wp->w_topline;
       }
       if (j < wp->w_grid.rows - 2) {               // not too far off
-        int i = plines_m_win(wp, wp->w_topline, wp->w_lines[0].wl_lnum - 1);
+        int i = plines_m_win(wp, wp->w_topline, wp->w_lines[0].wl_lnum - 1, true);
         // insert extra lines for previously invisible filler lines
         if (wp->w_lines[0].wl_lnum != wp->w_topline) {
           i += win_get_fill(wp, wp->w_lines[0].wl_lnum) - wp->w_old_topfill;
@@ -1265,7 +1738,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
       // needs updating.
 
       // try to find wp->w_topline in wp->w_lines[].wl_lnum
-      long j = -1;
+      int j = -1;
       int row = 0;
       for (int i = 0; i < wp->w_lines_valid; i++) {
         if (wp->w_lines[i].wl_valid
@@ -1304,7 +1777,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
           // bot_start to the first row that needs redrawing.
           bot_start = 0;
           int idx = 0;
-          for (;;) {
+          while (true) {
             wp->w_lines[idx] = wp->w_lines[j];
             // stop at line that didn't fit, unless it is still
             // valid (no lines deleted)
@@ -1417,7 +1890,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
       // First compute the actual start and end column.
       if (VIsual_mode == Ctrl_V) {
         colnr_T fromc, toc;
-        unsigned int save_ve_flags = curwin->w_ve_flags;
+        unsigned save_ve_flags = curwin->w_ve_flags;
 
         if (curwin->w_p_lbr) {
           curwin->w_ve_flags = VE_ALL;
@@ -1441,7 +1914,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
                  pos.lnum += cursor_above ? 1 : -1) {
               colnr_T t;
 
-              pos.col = (colnr_T)strlen(ml_get_buf(wp->w_buffer, pos.lnum, false));
+              pos.col = (colnr_T)strlen(ml_get_buf(wp->w_buffer, pos.lnum));
               getvvcol(wp, &pos, NULL, NULL, &t);
               if (toc < t) {
                 toc = t;
@@ -1548,19 +2021,34 @@ static void win_update(win_T *wp, DecorProviders *providers)
     wp->w_old_visual_col = 0;
   }
 
-  bool cursorline_standout = win_cursorline_standout(wp);
+  foldinfo_T cursorline_fi = { 0 };
+  wp->w_cursorline = win_cursorline_standout(wp) ? wp->w_cursor.lnum : 0;
+  if (wp->w_p_cul) {
+    // Make sure that the cursorline on a closed fold is redrawn
+    cursorline_fi = fold_info(wp, wp->w_cursor.lnum);
+    if (cursorline_fi.fi_level != 0 && cursorline_fi.fi_lines > 0) {
+      wp->w_cursorline = cursorline_fi.fi_lnum;
+    }
+  }
 
   win_check_ns_hl(wp);
 
+  spellvars_T spv = { 0 };
+  linenr_T lnum = wp->w_topline;  // first line shown in window
+  // Initialize spell related variables for the first drawn line.
+  if (spell_check_window(wp)) {
+    spv.spv_has_spell = true;
+    spv.spv_unchanged = mod_top == 0;
+  }
+
   // Update all the window rows.
   int idx = 0;                    // first entry in w_lines[].wl_size
   int row = 0;                    // current window row to display
   int srow = 0;                   // starting row of the current line
-  linenr_T lnum = wp->w_topline;  // first line shown in window
 
   bool eof = false;             // if true, we hit the end of the file
   bool didline = false;         // if true, we finished the last line
-  for (;;) {
+  while (true) {
     // stop updating when reached the end of the window (check for _past_
     // the end of the window is at the end of the loop)
     if (row == wp->w_grid.rows) {
@@ -1604,7 +2092,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
                         // if lines were inserted or deleted
                         || (wp->w_match_head != NULL
                             && buf->b_mod_xlines != 0)))))
-        || (cursorline_standout && lnum == wp->w_cursor.lnum)
+        || lnum == wp->w_cursorline
         || lnum == wp->w_last_cursorline) {
       if (lnum == mod_top) {
         top_to_mod = false;
@@ -1620,8 +2108,6 @@ static void win_update(win_T *wp, DecorProviders *providers)
           && !(dollar_vcol >= 0 && mod_bot == mod_top + 1)
           && row >= top_end) {
         int old_rows = 0;
-        int new_rows = 0;
-        int xtra_rows;
         linenr_T l;
         int i;
 
@@ -1656,14 +2142,20 @@ static void win_update(win_T *wp, DecorProviders *providers)
           bot_start = 0;
           bot_scroll_start = 0;
         } else {
+          int new_rows = 0;
           // Able to count old number of rows: Count new window
           // rows, and may insert/delete lines
-          long j = idx;
+          int j = idx;
           for (l = lnum; l < mod_bot; l++) {
             if (hasFoldingWin(wp, l, NULL, &l, true, NULL)) {
               new_rows++;
             } else if (l == wp->w_topline) {
-              new_rows += plines_win_nofill(wp, l, true) + wp->w_topfill;
+              int n = plines_win_nofill(wp, l, false) + wp->w_topfill;
+              n -= adjust_plines_for_skipcol(wp);
+              if (n > wp->w_height_inner) {
+                n = wp->w_height_inner;
+              }
+              new_rows += n;
             } else {
               new_rows += plines_win(wp, l, true);
             }
@@ -1674,7 +2166,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
               break;
             }
           }
-          xtra_rows = new_rows - old_rows;
+          int xtra_rows = new_rows - old_rows;
           if (xtra_rows < 0) {
             // May scroll text up.  If there is not enough
             // remaining text or scrolling fails, must redraw the
@@ -1711,17 +2203,17 @@ static void win_update(win_T *wp, DecorProviders *providers)
               int x = row + new_rows;
 
               // move entries in w_lines[] upwards
-              for (;;) {
+              while (true) {
                 // stop at last valid entry in w_lines[]
                 if (i >= wp->w_lines_valid) {
-                  wp->w_lines_valid = (int)j;
+                  wp->w_lines_valid = j;
                   break;
                 }
                 wp->w_lines[j] = wp->w_lines[i];
                 // stop at a line that won't fit
                 if (x + (int)wp->w_lines[j].wl_size
                     > wp->w_grid.rows) {
-                  wp->w_lines_valid = (int)j + 1;
+                  wp->w_lines_valid = j + 1;
                   break;
                 }
                 x += wp->w_lines[j++].wl_size;
@@ -1756,7 +2248,8 @@ static void win_update(win_T *wp, DecorProviders *providers)
       // When lines are folded, display one line for all of them.
       // Otherwise, display normally (can be several display lines when
       // 'wrap' is on).
-      foldinfo_T foldinfo = fold_info(wp, lnum);
+      foldinfo_T foldinfo = wp->w_p_cul && lnum == wp->w_cursor.lnum
+                            ? cursorline_fi : fold_info(wp, lnum);
 
       if (foldinfo.fi_lines == 0
           && idx < wp->w_lines_valid
@@ -1778,9 +2271,10 @@ static void win_update(win_T *wp, DecorProviders *providers)
         }
 
         // Display one line
-        row = win_line(wp, lnum, srow,
-                       foldinfo.fi_lines ? srow : wp->w_grid.rows,
-                       mod_top == 0, false, foldinfo, &line_providers, &provider_err);
+        spellvars_T zero_spv = { 0 };
+        row = win_line(wp, lnum, srow, wp->w_grid.rows, false,
+                       foldinfo.fi_lines > 0 ? &zero_spv : &spv,
+                       foldinfo, &line_providers);
 
         if (foldinfo.fi_lines == 0) {
           wp->w_lines[idx].wl_folded = false;
@@ -1792,6 +2286,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
           wp->w_lines[idx].wl_folded = true;
           wp->w_lines[idx].wl_lastlnum = lnum + foldinfo.fi_lines;
           did_update = DID_FOLD;
+          spv.spv_capcol_lnum = 0;
         }
       }
 
@@ -1815,9 +2310,9 @@ static void win_update(win_T *wp, DecorProviders *providers)
       if (wp->w_p_rnu && wp->w_last_cursor_lnum_rnu != wp->w_cursor.lnum) {
         // 'relativenumber' set and cursor moved vertically: The
         // text doesn't need to be drawn, but the number column does.
-        foldinfo_T info = fold_info(wp, lnum);
-        (void)win_line(wp, lnum, srow, wp->w_grid.rows, true, true,
-                       info, &line_providers, &provider_err);
+        foldinfo_T info = wp->w_p_cul && lnum == wp->w_cursor.lnum
+                          ? cursorline_fi : fold_info(wp, lnum);
+        (void)win_line(wp, lnum, srow, wp->w_grid.rows, true, &spv, info, &line_providers);
       }
 
       // This line does not need to be drawn, advance to the next one.
@@ -1827,6 +2322,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
       }
       lnum = wp->w_lines[idx - 1].wl_lastlnum + 1;
       did_update = DID_NONE;
+      spv.spv_capcol_lnum = 0;
     }
 
     // 'statuscolumn' width has changed or errored, start from the top.
@@ -1837,7 +2333,8 @@ static void win_update(win_T *wp, DecorProviders *providers)
       lnum = wp->w_topline;
       wp->w_lines_valid = 0;
       wp->w_valid &= ~VALID_WCOL;
-      decor_providers_invoke_win(wp, providers, &line_providers, &provider_err);
+      decor_redraw_reset(wp, &decor_state);
+      decor_providers_invoke_win(wp, providers, &line_providers);
       continue;
     }
 
@@ -1850,7 +2347,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
 
   // Now that the window has been redrawn with the old and new cursor line,
   // update w_last_cursorline.
-  wp->w_last_cursorline = cursorline_standout ? wp->w_cursor.lnum : 0;
+  wp->w_last_cursorline = wp->w_cursorline;
 
   wp->w_last_cursor_lnum_rnu = wp->w_p_rnu ? wp->w_cursor.lnum : 0;
 
@@ -1880,24 +2377,21 @@ static void win_update(win_T *wp, DecorProviders *providers)
       wp->w_botline = lnum;
       wp->w_filler_rows = wp->w_grid.rows - srow;
     } else if (dy_flags & DY_TRUNCATE) {      // 'display' has "truncate"
-      int scr_row = wp->w_grid.rows - 1;
-      int symbol = wp->w_p_fcs_chars.lastline;
-      char fillbuf[12];  // 2 characters of 6 bytes
-      int charlen = utf_char2bytes(symbol, &fillbuf[0]);
-      utf_char2bytes(symbol, &fillbuf[charlen]);
-
       // Last line isn't finished: Display "@@@" in the last screen line.
-      grid_puts_len(&wp->w_grid, fillbuf, MIN(wp->w_grid.cols, 2) * charlen, scr_row, 0, at_attr);
-      grid_fill(&wp->w_grid, scr_row, scr_row + 1, 2, wp->w_grid.cols, symbol, ' ', at_attr);
+      grid_line_start(&wp->w_grid, wp->w_grid.rows - 1);
+      grid_line_fill(0, MIN(wp->w_grid.cols, 3), wp->w_p_fcs_chars.lastline, at_attr);
+      grid_line_fill(3, wp->w_grid.cols, ' ', at_attr);
+      grid_line_flush();
       set_empty_rows(wp, srow);
       wp->w_botline = lnum;
     } else if (dy_flags & DY_LASTLINE) {      // 'display' has "lastline"
-      int start_col = wp->w_grid.cols - 3;
-      int symbol = wp->w_p_fcs_chars.lastline;
-
       // Last line isn't finished: Display "@@@" at the end.
-      grid_fill(&wp->w_grid, wp->w_grid.rows - 1, wp->w_grid.rows,
-                MAX(start_col, 0), wp->w_grid.cols, symbol, symbol, at_attr);
+      // If this would split a doublewidth char in two, we need to display "@@@@" instead
+      grid_line_start(&wp->w_grid, wp->w_grid.rows - 1);
+      int width = grid_line_getchar(MAX(wp->w_grid.cols - 3, 0), NULL) == NUL ? 4 : 3;
+      grid_line_fill(MAX(wp->w_grid.cols - width, 0), wp->w_grid.cols,
+                     wp->w_p_fcs_chars.lastline, at_attr);
+      grid_line_flush();
       set_empty_rows(wp, srow);
       wp->w_botline = lnum;
     } else {
@@ -1908,13 +2402,14 @@ static void win_update(win_T *wp, DecorProviders *providers)
   } else {
     if (eof) {  // we hit the end of the file
       wp->w_botline = buf->b_ml.ml_line_count + 1;
-      long j = win_get_fill(wp, wp->w_botline);
+      int j = win_get_fill(wp, wp->w_botline);
       if (j > 0 && !wp->w_botfill && row < wp->w_grid.rows) {
         // Display filler text below last line. win_line() will check
         // for ml_line_count+1 and only draw filler lines
-        foldinfo_T info = { 0 };
-        row = win_line(wp, wp->w_botline, row, wp->w_grid.rows,
-                       false, false, info, &line_providers, &provider_err);
+        spellvars_T zero_spv = { 0 };
+        foldinfo_T zero_foldinfo = { 0 };
+        row = win_line(wp, wp->w_botline, row, wp->w_grid.rows, false, &zero_spv,
+                       zero_foldinfo, &line_providers);
       }
     } else if (dollar_vcol == -1) {
       wp->w_botline = lnum;
@@ -1988,12 +2483,162 @@ static void win_update(win_T *wp, DecorProviders *providers)
     }
   }
 
+  if (nrwidth_before != wp->w_nrwidth && buf->terminal) {
+    terminal_check_size(buf->terminal);
+  }
+
   // restore got_int, unless CTRL-C was hit while redrawing
   if (!got_int) {
     got_int = save_got_int;
   }
 }
 
+/// Scroll `line_count` lines at 'row' in window 'wp'.
+///
+/// Positive `line_count` means scrolling down, so that more space is available
+/// at 'row'. Negative `line_count` implies deleting lines at `row`.
+void win_scroll_lines(win_T *wp, int row, int line_count)
+{
+  if (!redrawing() || line_count == 0) {
+    return;
+  }
+
+  // No lines are being moved, just draw over the entire area
+  if (row + abs(line_count) >= wp->w_grid.rows) {
+    return;
+  }
+
+  if (line_count < 0) {
+    grid_del_lines(&wp->w_grid, row, -line_count,
+                   wp->w_grid.rows, 0, wp->w_grid.cols);
+  } else {
+    grid_ins_lines(&wp->w_grid, row, line_count,
+                   wp->w_grid.rows, 0, wp->w_grid.cols);
+  }
+}
+
+/// Call grid_fill() with columns adjusted for 'rightleft' if needed.
+/// Return the new offset.
+static int win_fill_end(win_T *wp, int c1, int c2, int off, int width, int row, int endrow,
+                        int attr)
+{
+  int nn = off + width;
+  const int endcol = wp->w_grid.cols;
+
+  if (nn > endcol) {
+    nn = endcol;
+  }
+
+  if (wp->w_p_rl) {
+    grid_fill(&wp->w_grid, row, endrow, endcol - nn, endcol - off, c1, c2, attr);
+  } else {
+    grid_fill(&wp->w_grid, row, endrow, off, nn, c1, c2, attr);
+  }
+
+  return nn;
+}
+
+/// Clear lines near the end of the window and mark the unused lines with "c1".
+/// Use "c2" as filler character.
+/// When "draw_margin" is true, then draw the sign/fold/number columns.
+void win_draw_end(win_T *wp, int c1, int c2, bool draw_margin, int row, int endrow, hlf_T hl)
+{
+  assert(hl >= 0 && hl < HLF_COUNT);
+  int n = 0;
+
+  if (draw_margin) {
+    // draw the fold column
+    int fdc = compute_foldcolumn(wp, 0);
+    if (fdc > 0) {
+      n = win_fill_end(wp, ' ', ' ', n, fdc, row, endrow,
+                       win_hl_attr(wp, HLF_FC));
+    }
+    // draw the sign column
+    int count = wp->w_scwidth;
+    if (count > 0) {
+      n = win_fill_end(wp, ' ', ' ', n, SIGN_WIDTH * count, row,
+                       endrow, win_hl_attr(wp, HLF_SC));
+    }
+    // draw the number column
+    if ((wp->w_p_nu || wp->w_p_rnu) && vim_strchr(p_cpo, CPO_NUMCOL) == NULL) {
+      n = win_fill_end(wp, ' ', ' ', n, number_width(wp) + 1, row, endrow,
+                       win_hl_attr(wp, HLF_N));
+    }
+  }
+
+  int attr = hl_combine_attr(win_bg_attr(wp), win_hl_attr(wp, (int)hl));
+
+  const int endcol = wp->w_grid.cols;
+  if (wp->w_p_rl) {
+    grid_fill(&wp->w_grid, row, endrow, 0, endcol - 1 - n, c2, c2, attr);
+    grid_fill(&wp->w_grid, row, endrow, endcol - 1 - n, endcol - n, c1, c2, attr);
+  } else {
+    grid_fill(&wp->w_grid, row, endrow, n, endcol, c1, c2, attr);
+  }
+}
+
+/// Compute the width of the foldcolumn.  Based on 'foldcolumn' and how much
+/// space is available for window "wp", minus "col".
+int compute_foldcolumn(win_T *wp, int col)
+{
+  int fdc = win_fdccol_count(wp);
+  int wmw = wp == curwin && p_wmw == 0 ? 1 : (int)p_wmw;
+  int wwidth = wp->w_grid.cols;
+
+  if (fdc > wwidth - (col + wmw)) {
+    fdc = wwidth - (col + wmw);
+  }
+  return fdc;
+}
+
+/// Return the width of the 'number' and 'relativenumber' column.
+/// Caller may need to check if 'number' or 'relativenumber' is set.
+/// Otherwise it depends on 'numberwidth' and the line count.
+int number_width(win_T *wp)
+{
+  linenr_T lnum;
+
+  if (wp->w_p_rnu && !wp->w_p_nu) {
+    // cursor line shows "0"
+    lnum = wp->w_height_inner;
+  } else {
+    // cursor line shows absolute line number
+    lnum = wp->w_buffer->b_ml.ml_line_count;
+  }
+
+  if (lnum == wp->w_nrwidth_line_count) {
+    return wp->w_nrwidth_width;
+  }
+  wp->w_nrwidth_line_count = lnum;
+
+  // reset for 'statuscolumn'
+  if (*wp->w_p_stc != NUL) {
+    wp->w_statuscol_line_count = 0;  // make sure width is re-estimated
+    wp->w_nrwidth_width = (wp->w_p_nu || wp->w_p_rnu) * (int)wp->w_p_nuw;
+    return wp->w_nrwidth_width;
+  }
+
+  int n = 0;
+  do {
+    lnum /= 10;
+    n++;
+  } while (lnum > 0);
+
+  // 'numberwidth' gives the minimal width plus one
+  if (n < wp->w_p_nuw - 1) {
+    n = (int)wp->w_p_nuw - 1;
+  }
+
+  // If 'signcolumn' is set to 'number' and there is a sign to display, then
+  // the minimal width for the number column is 2.
+  if (n < 2 && wp->w_buffer->b_signs_with_text && wp->w_minscwidth == SCL_NUM) {
+    n = 2;
+  }
+
+  wp->w_nrwidth_width = n;
+  return n;
+}
+
 /// Redraw a window later, with wp->w_redr_type >= type.
 ///
 /// Set must_redraw only if not already set to a higher value.
@@ -2097,7 +2742,7 @@ void status_redraw_all(void)
   bool is_stl_global = global_stl_height() != 0;
 
   FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
-    if ((!is_stl_global && wp->w_status_height) || (is_stl_global && wp == curwin)
+    if ((!is_stl_global && wp->w_status_height) || wp == curwin
         || wp->w_winbar_height) {
       wp->w_redr_status = true;
       redraw_later(wp, UPD_VALID);
@@ -2123,6 +2768,11 @@ void status_redraw_buf(buf_T *buf)
       redraw_later(wp, UPD_VALID);
     }
   }
+  // Redraw the ruler if it is in the command line and was not marked for redraw above
+  if (p_ru && !curwin->w_status_height && !curwin->w_redr_status) {
+    redraw_cmdline = true;
+    redraw_later(curwin, UPD_VALID);
+  }
 }
 
 /// Redraw all status lines that need to be redrawn.
@@ -2182,3 +2832,48 @@ void redrawWinline(win_T *wp, linenr_T lnum)
     redraw_later(wp, UPD_VALID);
   }
 }
+
+/// Return true if the cursor line in window "wp" may be concealed, according
+/// to the 'concealcursor' option.
+bool conceal_cursor_line(const win_T *wp)
+  FUNC_ATTR_NONNULL_ALL
+{
+  int c;
+
+  if (*wp->w_p_cocu == NUL) {
+    return false;
+  }
+  if (get_real_state() & MODE_VISUAL) {
+    c = 'v';
+  } else if (State & MODE_INSERT) {
+    c = 'i';
+  } else if (State & MODE_NORMAL) {
+    c = 'n';
+  } else if (State & MODE_CMDLINE) {
+    c = 'c';
+  } else {
+    return false;
+  }
+  return vim_strchr(wp->w_p_cocu, c) != NULL;
+}
+
+/// Whether cursorline is drawn in a special way
+///
+/// If true, both old and new cursorline will need to be redrawn when moving cursor within windows.
+bool win_cursorline_standout(const win_T *wp)
+  FUNC_ATTR_NONNULL_ALL
+{
+  return wp->w_p_cul || (wp->w_p_cole > 0 && !conceal_cursor_line(wp));
+}
+
+/// Redraw when w_cline_row changes and 'relativenumber' or 'cursorline' is set.
+/// Also when concealing is on and 'concealcursor' is not active.
+void redraw_for_cursorline(win_T *wp)
+  FUNC_ATTR_NONNULL_ALL
+{
+  if ((wp->w_valid & VALID_CROW) == 0 && !pum_visible()
+      && (wp->w_p_rnu || win_cursorline_standout(wp))) {
+    // win_line() will redraw the number column and cursorline only.
+    redraw_later(wp, UPD_VALID);
+  }
+}