refactor(grid): use batched updates for statusline and ruler

src/nvim/drawscreen.c

@@ -1094,8 +1094,11 @@ int showmode(void)
   // 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) {
+  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(false);
   }
 
   redraw_cmdline = false;

src/nvim/grid.c

@@ -953,6 +953,7 @@ void win_grid_alloc(win_T *wp)
   if ((resizing_screen || was_resized) && want_allocation) {
     ui_call_grid_resize(grid_allocated->handle,
                         grid_allocated->cols, grid_allocated->rows);
+    ui_check_cursor_grid(grid_allocated->handle);
   }
 }
 

src/nvim/statusline.c

@@ -62,8 +62,6 @@ typedef enum {
 /// If inversion is possible we use it. Else '=' characters are used.
 void win_redr_status(win_T *wp)
 {
-  int row;
-  int col;
   char *p;
   int len;
   int fillchar;
@@ -151,16 +149,15 @@ void win_redr_status(win_T *wp)
       }
     }
 
-    row = is_stl_global ? (Rows - (int)p_ch - 1) : W_ENDROW(wp);
-    col = is_stl_global ? 0 : wp->w_wincol;
-    int width = grid_puts(&default_grid, p, -1, row, col, attr);
-    grid_fill(&default_grid, row, row + 1, width + col,
-              this_ru_col + col, fillchar, fillchar, attr);
+    grid_line_start(&default_grid, is_stl_global ? (Rows - (int)p_ch - 1) : W_ENDROW(wp));
+    int col = is_stl_global ? 0 : wp->w_wincol;
+
+    int width = grid_line_puts(col, p, -1, attr);
+    grid_line_fill(width + col, this_ru_col + col, fillchar, attr);
 
     if (get_keymap_str(wp, "<%s>", NameBuff, MAXPATHL)
         && this_ru_col - len > (int)(strlen(NameBuff) + 1)) {
-      grid_puts(&default_grid, NameBuff, -1, row,
-                (int)((size_t)this_ru_col - strlen(NameBuff) - 1), attr);
+      grid_line_puts((int)((size_t)this_ru_col - strlen(NameBuff) - 1), NameBuff, -1, attr);
     }
 
     win_redr_ruler(wp);
@@ -170,10 +167,11 @@ void win_redr_status(win_T *wp)
       const int sc_width = MIN(10, this_ru_col - len - 2);
 
       if (sc_width > 0) {
-        grid_puts(&default_grid, showcmd_buf, sc_width, row,
-                  wp->w_wincol + this_ru_col - sc_width - 1, attr);
+        grid_line_puts(wp->w_wincol + this_ru_col - sc_width - 1, showcmd_buf, sc_width, attr);
       }
     }
+
+    grid_line_flush(false);
   }
 
   // May need to draw the character below the vertical separator.
@@ -419,7 +417,9 @@ static void win_redr_custom(win_T *wp, bool draw_winbar, bool draw_ruler)
   int start_col = col;
 
   // Draw each snippet with the specified highlighting.
-  grid_line_start(grid, row);
+  if (!draw_ruler) {
+    grid_line_start(grid, row);
+  }
 
   int curattr = attr;
   char *p = buf;
@@ -448,7 +448,9 @@ static void win_redr_custom(win_T *wp, bool draw_winbar, bool draw_ruler)
   // fill up with "fillchar"
   grid_line_fill(col, maxcol, fillchar, curattr);
 
-  grid_line_flush(false);
+  if (!draw_ruler) {
+    grid_line_flush(false);
+  }
 
   // Fill the tab_page_click_defs, w_status_click_defs or w_winbar_click_defs array for clicking
   // in the tab page line, status line or window bar
@@ -481,6 +483,7 @@ void win_redr_winbar(win_T *wp)
   entered = false;
 }
 
+/// must be called after a grid_line_start() at the intended row
 void win_redr_ruler(win_T *wp)
 {
   bool is_stl_global = global_stl_height() > 0;
@@ -516,36 +519,28 @@ void win_redr_ruler(win_T *wp)
                    && *ml_get_buf(wp->w_buffer, wp->w_cursor.lnum) == NUL;
 
   int width;
-  int row;
   int fillchar;
   int attr;
   int off;
   bool part_of_status = false;
 
   if (wp->w_status_height) {
-    row = W_ENDROW(wp);
     fillchar = fillchar_status(&attr, wp);
     off = wp->w_wincol;
     width = wp->w_width;
     part_of_status = true;
   } else if (is_stl_global) {
-    row = Rows - (int)p_ch - 1;
     fillchar = fillchar_status(&attr, wp);
     off = 0;
     width = Columns;
     part_of_status = true;
   } else {
-    row = Rows - 1;
     fillchar = ' ';
     attr = HL_ATTR(HLF_MSG);
     width = Columns;
     off = 0;
   }
 
-  if (!part_of_status && p_ch == 0 && !ui_has(kUIMessages)) {
-    return;
-  }
-
   // In list mode virtcol needs to be recomputed
   colnr_T virtcol = wp->w_virtcol;
   if (wp->w_p_list && wp->w_p_lcs_chars.tab1 == NUL) {
@@ -617,11 +612,8 @@ void win_redr_ruler(win_T *wp)
       }
     }
 
-    ScreenGrid *grid = part_of_status ? &default_grid : &msg_grid_adj;
-    grid_puts(grid, buffer, -1, row, this_ru_col + off, attr);
-    grid_fill(grid, row, row + 1,
-              this_ru_col + off + (int)strlen(buffer), off + width, fillchar,
-              fillchar, attr);
+    int w = grid_line_puts(this_ru_col + off, buffer, -1, attr);
+    grid_line_fill(this_ru_col + off + w, off + width, fillchar, attr);
   }
 }
 

test/functional/ui/multigrid_spec.lua

@@ -2887,7 +2887,7 @@ describe('ext_multigrid', function()
     ## grid 3
                                                            |
     ## grid 4
-      ^Lorem i|
+      Lorem i|
       psum do|
       lor sit|
        amet, |
@@ -2896,7 +2896,7 @@ describe('ext_multigrid', function()
       ipiscin|
       g elit,|
        sed do|
-       eiusmo|
+       ^eiusmo|
       {1:~      }|
     ## grid 5
       some text                     |