Merge pull request #23503 from neovim/backport-23415-to-release-0.9

[Backport release-0.9] fix(tui): redraw on SIGWINCH even if size didn't change

src/nvim/tui/tui.c

@@ -1528,12 +1528,11 @@ void tui_guess_size(TUIData *tui)
     height = DFLT_ROWS;
   }
 
-  if (tui->width != width || tui->height != height) {
+  tui->width = width;
-    tui->width = width;
+  tui->height = height;
-    tui->height = height;
 
-    ui_client_set_size(width, height);
+  // Redraw on SIGWINCH event if size didn't change. #23411
-  }
+  ui_client_set_size(width, height);
 }
 
 static void unibi_goto(TUIData *tui, int row, int col)

test/functional/terminal/tui_spec.lua

@@ -1565,6 +1565,29 @@ describe('TUI', function()
       {5:-- TERMINAL --}                                    |
     ]])
   end)
+
+  it('redraws on SIGWINCH even if terminal size is unchanged #23411', function()
+    child_session:request('nvim_echo', {{'foo'}}, false, {})
+    screen:expect([[
+      {1: }                                                 |
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {5:[No Name]                                         }|
+      foo                                               |
+      {3:-- TERMINAL --}                                    |
+    ]])
+    exec_lua([[vim.loop.kill(vim.fn.jobpid(vim.bo.channel), 'sigwinch')]])
+    screen:expect([[
+      {1: }                                                 |
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {5:[No Name]                                         }|
+                                                        |
+      {3:-- TERMINAL --}                                    |
+    ]])
+  end)
 end)
 
 describe('TUI', function()