fix(ui): make winbar work with floats and multigrid

src/nvim/os/input.c

@@ -183,7 +183,7 @@ void os_breakcheck(void)
   // We do not want screen_resize() to redraw here.
   // TODO(bfredl): we are already special casing redraw events, is this
   // hack still needed?
-  updating_screen++;
+  updating_screen = true;
 
   loop_poll_events(&main_loop, 0);
 

src/nvim/screen.c

@@ -5324,8 +5324,10 @@ static void win_redr_custom(win_T *wp, bool draw_winbar, bool draw_ruler)
     use_sandbox = was_set_insecurely(wp, "tabline", 0);
   } else if (draw_winbar) {
     stl = (char_u *)((*wp->w_p_wbr != NUL) ? wp->w_p_wbr : p_wbr);
-    row = wp->w_winrow;
+    row = -1;  // row zero is first row of text
-    col = wp->w_wincol;
+    col = 0;
+    grid = &wp->w_grid;
+    grid_adjust(&grid, &row, &col);
     fillchar = wp->w_p_fcs_chars.wbr;
     attr = (wp == curwin) ? HL_ATTR(HLF_WBR) : HL_ATTR(HLF_WBRNC);
     maxwidth = wp->w_width_inner;

src/nvim/window.c

@@ -6296,7 +6296,7 @@ void win_set_inner_size(win_T *wp)
 
 static int win_extra_height(win_T *wp)
 {
-  return wp->w_border_adj[0] + wp->w_border_adj[2];
+  return wp->w_border_adj[0] + wp->w_border_adj[2] + wp->w_winbar_height;
 }
 
 static int win_extra_width(win_T *wp)

test/functional/ui/float_spec.lua

@@ -7591,6 +7591,53 @@ describe('float window', function()
         ]]}
       end
     end)
+
+    it('can use winbar', function()
+      local buf = meths.create_buf(false,false)
+      local win1 = meths.open_win(buf, false, {relative='editor', width=15, height=3, row=1, col=5})
+      meths.win_set_option(win1, 'winbar', 'floaty bar')
+
+      if multigrid then
+        screen:expect{grid=[[
+        ## grid 1
+          [2:----------------------------------------]|
+          [2:----------------------------------------]|
+          [2:----------------------------------------]|
+          [2:----------------------------------------]|
+          [2:----------------------------------------]|
+          [2:----------------------------------------]|
+          [3:----------------------------------------]|
+        ## grid 2
+          ^                                        |
+          {0:~                                       }|
+          {0:~                                       }|
+          {0:~                                       }|
+          {0:~                                       }|
+          {0:~                                       }|
+        ## grid 3
+                                                  |
+        ## grid 4
+          {3:floaty bar     }|
+          {1:               }|
+          {2:~              }|
+        ]], float_pos={
+          [4] = {{id = 1001}, "NW", 1, 1, 5, true, 50};
+        }, win_viewport={
+          [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1};
+          [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1};
+        }}
+      else
+        screen:expect{grid=[[
+          ^                                        |
+          {0:~    }{3:floaty bar     }{0:                    }|
+          {0:~    }{1:               }{0:                    }|
+          {0:~    }{2:~              }{0:                    }|
+          {0:~                                       }|
+          {0:~                                       }|
+                                                  |
+        ]]}
+      end
+    end)
   end
 
   describe('with ext_multigrid', function()

test/functional/ui/multigrid_spec.lua

@@ -2369,4 +2369,44 @@ describe('ext_multigrid', function()
       [2] = {win = {id = 1000}, topline = 6, botline = 12, curline = 10, curcol = 1, linecount = 11},
     }}
   end)
+
+  it('with winbar', function()
+    command 'split'
+    command 'setlocal winbar=very\\ bar'
+    screen:expect{grid=[[
+    ## grid 1
+      [4:-----------------------------------------------------]|
+      [4:-----------------------------------------------------]|
+      [4:-----------------------------------------------------]|
+      [4:-----------------------------------------------------]|
+      [4:-----------------------------------------------------]|
+      [4:-----------------------------------------------------]|
+      {11:[No Name]                                            }|
+      [2:-----------------------------------------------------]|
+      [2:-----------------------------------------------------]|
+      [2:-----------------------------------------------------]|
+      [2:-----------------------------------------------------]|
+      [2:-----------------------------------------------------]|
+      {12:[No Name]                                            }|
+      [3:-----------------------------------------------------]|
+    ## grid 2
+                                                           |
+      {1:~                                                    }|
+      {1:~                                                    }|
+      {1:~                                                    }|
+      {1:~                                                    }|
+    ## grid 3
+                                                           |
+    ## grid 4
+      {7:very bar                                             }|
+      ^                                                     |
+      {1:~                                                    }|
+      {1:~                                                    }|
+      {1:~                                                    }|
+      {1:~                                                    }|
+    ]], win_viewport={
+      [2] = {win = {id = 1000}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1};
+      [4] = {win = {id = 1001}, topline = 0, botline = 2, curline = 0, curcol = 0, linecount = 1};
+    }}
+  end)
 end)