fix(ui): update title in more cases (#31508)

src/nvim/drawscreen.c

@@ -679,6 +679,10 @@ int update_screen(void)
 
   updating_screen = false;
 
+  if (need_maketitle) {
+    maketitle();
+  }
+
   // Clear or redraw the command line.  Done last, because scrolling may
   // mess up the command line.
   if (clear_cmdline || redraw_cmdline || redraw_mode) {
@@ -856,6 +860,19 @@ void setcursor_mayforce(win_T *wp, bool force)
   }
 }
 
+/// Mark the title and icon for redraw if either of them uses statusline format.
+///
+/// @return  whether either title or icon uses statusline format.
+bool redraw_custom_title_later(void)
+{
+  if ((p_icon && (stl_syntax & STL_IN_ICON))
+      || (p_title && (stl_syntax & STL_IN_TITLE))) {
+    need_maketitle = true;
+    return true;
+  }
+  return false;
+}
+
 /// Show current cursor info in ruler and various other places
 ///
 /// @param always  if false, only show ruler if position has changed.
@@ -889,10 +906,7 @@ void show_cursor_info_later(bool force)
       curwin->w_redr_status = true;
     }
 
-    if ((p_icon && (stl_syntax & STL_IN_ICON))
-        || (p_title && (stl_syntax & STL_IN_TITLE))) {
-      need_maketitle = true;
-    }
+    redraw_custom_title_later();
   }
 
   curwin->w_stl_cursor = curwin->w_cursor;
@@ -2773,6 +2787,10 @@ void redraw_statuslines(void)
   if (redraw_tabline) {
     draw_tabline();
   }
+
+  if (need_maketitle) {
+    maketitle();
+  }
 }
 
 /// Redraw all status lines at the bottom of frame "frp".

src/nvim/ex_getln.c

@@ -847,6 +847,10 @@ static uint8_t *command_line_enter(int firstc, int count, int indent, bool clear
       found_one = true;
     }
 
+    if (redraw_custom_title_later()) {
+      found_one = true;
+    }
+
     if (found_one) {
       redraw_statuslines();
     }
@@ -959,6 +963,7 @@ theend:
     msg_ext_clear_later();
   }
   if (!cmd_silent) {
+    redraw_custom_title_later();
     status_redraw_all();  // redraw to show mode change
   }
 

src/nvim/normal.c

@@ -1372,10 +1372,6 @@ static void normal_redraw(NormalState *s)
     }
   }
 
-  if (need_maketitle) {
-    maketitle();
-  }
-
   curbuf->b_last_used = time(NULL);
 
   // Display message after redraw. If an external message is still visible,

src/nvim/terminal.c

@@ -619,6 +619,7 @@ bool terminal_enter(void)
   invalidate_terminal(s->term, s->term->cursor.row, s->term->cursor.row + 1);
   showmode();
   curwin->w_redr_status = true;  // For mode() in statusline. #8323
+  redraw_custom_title_later();
   ui_busy_start();
   apply_autocmds(EVENT_TERMENTER, NULL, NULL, false, curbuf);
   may_trigger_modechanged();

test/functional/ui/title_spec.lua

@@ -37,6 +37,63 @@ describe('title', function()
     end)
   end)
 
+  it('is updated in Insert mode', function()
+    api.nvim_set_option_value('title', true, {})
+    screen:expect(function()
+      eq('[No Name] - Nvim', screen.title)
+    end)
+    feed('ifoo')
+    screen:expect(function()
+      eq('[No Name] + - Nvim', screen.title)
+    end)
+    feed('<Esc>')
+    api.nvim_set_option_value('titlestring', '%m %f (%{mode(1)}) | nvim', {})
+    screen:expect(function()
+      eq('[+] [No Name] (n) | nvim', screen.title)
+    end)
+    feed('i')
+    screen:expect(function()
+      eq('[+] [No Name] (i) | nvim', screen.title)
+    end)
+    feed('<Esc>')
+    screen:expect(function()
+      eq('[+] [No Name] (n) | nvim', screen.title)
+    end)
+  end)
+
+  it('is updated in Cmdline mode', function()
+    api.nvim_set_option_value('title', true, {})
+    api.nvim_set_option_value('titlestring', '%f (%{mode(1)}) | nvim', {})
+    screen:expect(function()
+      eq('[No Name] (n) | nvim', screen.title)
+    end)
+    feed(':')
+    screen:expect(function()
+      eq('[No Name] (c) | nvim', screen.title)
+    end)
+    feed('<Esc>')
+    screen:expect(function()
+      eq('[No Name] (n) | nvim', screen.title)
+    end)
+  end)
+
+  it('is updated in Terminal mode', function()
+    api.nvim_set_option_value('title', true, {})
+    api.nvim_set_option_value('titlestring', '(%{mode(1)}) | nvim', {})
+    fn.termopen({ n.testprg('shell-test'), 'INTERACT' })
+    screen:expect(function()
+      eq('(nt) | nvim', screen.title)
+    end)
+    feed('i')
+    screen:expect(function()
+      eq('(t) | nvim', screen.title)
+    end)
+    feed([[<C-\><C-N>]])
+    screen:expect(function()
+      eq('(nt) | nvim', screen.title)
+    end)
+  end)
+
   describe('is not changed by', function()
     local file1 = is_os('win') and 'C:\\mydir\\myfile1' or '/mydir/myfile1'
     local file2 = is_os('win') and 'C:\\mydir\\myfile2' or '/mydir/myfile2'