backport: fix(windowing): positioning of relative floats

Fix relative floating windows so that they open in the correct position
relative to each other. Also make sure that their positions are correct
immediately after creation without a redraw.

1 files changed, 33 insertions, 1 deletions

diff --git a/src/nvim/window.c b/src/nvim/window.c
index 472a52e113..a64dee24a0 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -737,6 +737,37 @@ void win_config_float(win_T *wp, FloatConfig fconfig)
     redraw_later(wp, NOT_VALID);
   }
 
+  // compute initial position
+  if (wp->w_float_config.relative == kFloatRelativeWindow) {
+    int row = wp->w_float_config.row;
+    int col = wp->w_float_config.col;
+    Error dummy = ERROR_INIT;
+    win_T *parent = find_window_by_handle(wp->w_float_config.window, &dummy);
+    if (parent) {
+      row += parent->w_winrow;
+      col += parent->w_wincol;
+      ScreenGrid *grid = &parent->w_grid;
+      int row_off = 0, col_off = 0;
+      screen_adjust_grid(&grid, &row_off, &col_off);
+      row += row_off;
+      col += col_off;
+    }
+    api_clear_error(&dummy);
+    if (wp->w_float_config.bufpos.lnum >= 0) {
+      pos_T pos = { wp->w_float_config.bufpos.lnum + 1,
+        wp->w_float_config.bufpos.col, 0 };
+      int trow, tcol, tcolc, tcole;
+      textpos2screenpos(wp, &pos, &trow, &tcol, &tcolc, &tcole, true);
+      row += trow - 1;
+      col += tcol - 1;
+    }
+    wp->w_winrow = row;
+    wp->w_wincol = col;
+  } else {
+    wp->w_winrow = fconfig.row;
+    wp->w_wincol = fconfig.col;
+  }
+
   // changing border style while keeping border only requires redrawing border
   if (fconfig.border) {
     wp->w_redr_border = true;
@@ -770,7 +801,6 @@ int win_fdccol_count(win_T *wp)
   }
 }
 
-
 void ui_ext_win_position(win_T *wp)
 {
   if (!wp->w_floating) {
@@ -817,6 +847,8 @@ void ui_ext_win_position(win_T *wp)
 
       int comp_row = (int)row - (south ? wp->w_height : 0);
       int comp_col = (int)col - (east ? wp->w_width : 0);
+      comp_row += grid->comp_row;
+      comp_col += grid->comp_col;
       comp_row = MAX(MIN(comp_row, Rows-wp->w_height_outer-1), 0);
       comp_col = MAX(MIN(comp_col, Columns-wp->w_width_outer), 0);
       wp->w_winrow = comp_row;