feat(ui): add 'statuscolumn' option

Problem:    Unable to customize the column next to a window ('gutter').
Solution:   Add 'statuscolumn' option that follows the 'statusline' syntax,
	    allowing to customize the status column. Also supporting the %@
	    click execute function label. Adds new items @C and @s which
	    will print the fold and sign columns. Line numbers and signs
	    can be clicked, highlighted, aligned, transformed, margined etc.

1 files changed, 14 insertions, 2 deletions

diff --git a/src/nvim/drawscreen.c b/src/nvim/drawscreen.c
index de6bdda71e..568dbe99c0 100644
--- a/src/nvim/drawscreen.c
+++ b/src/nvim/drawscreen.c
@@ -522,7 +522,7 @@ int update_screen(void)
   // TODO(bfredl): special casing curwin here is SÅ JÄVLA BULL.
   // Either this should be done for all windows or not at all.
   if (curwin->w_redr_type < UPD_NOT_VALID
-      && curwin->w_nrwidth != ((curwin->w_p_nu || curwin->w_p_rnu)
+      && curwin->w_nrwidth != ((curwin->w_p_nu || curwin->w_p_rnu || *curwin->w_p_stc)
                                ? number_width(curwin) : 0)) {
     curwin->w_redr_type = UPD_NOT_VALID;
   }
@@ -1032,7 +1032,7 @@ static void win_update(win_T *wp, DecorProviders *providers)
 
   // Force redraw when width of 'number' or 'relativenumber' column
   // changes.
-  int nrwidth = (wp->w_p_nu || wp->w_p_rnu) ? number_width(wp) : 0;
+  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;
@@ -1823,6 +1823,18 @@ static void win_update(win_T *wp, DecorProviders *providers)
       did_update = DID_NONE;
     }
 
+    // 'statuscolumn' width has changed or errored, start from the top.
+    if (wp->w_redr_statuscol) {
+      wp->w_redr_statuscol = false;
+      idx = 0;
+      row = 0;
+      lnum = wp->w_topline;
+      wp->w_lines_valid = 0;
+      wp->w_valid &= ~VALID_WCOL;
+      decor_providers_invoke_win(wp, providers, &line_providers, &provider_err);
+      continue;
+    }
+
     if (lnum > buf->b_ml.ml_line_count) {
       eof = true;
       break;