Fix a regression that caused automatic color themes to not be re-applied after config file reload

The reload was only happening if the auto theme config file had its mtime
updated, since the last time it was checked.

Fixes #8530

docs/changelog.rst

@@ -101,6 +101,8 @@ Detailed list of changes
 
 - diff kitten: Add half page and full page scroll vim-like bindings (:pull:`8514`)
 
+- Fix a regression that caused automatic color themes to not be re-applied after config file reload (:iss:`8530`)
+
 0.41.1 [2025-04-03]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

kitty/boss.py

@@ -2695,8 +2695,10 @@ class Boss:
         for tm in self.all_tab_managers:
             tm.apply_options()
         # Update colors
-        if theme_colors.applied_theme and theme_colors.refresh():
-            theme_colors.apply_theme(theme_colors.applied_theme, notify_on_bg_change=False)
+        if theme_colors.has_applied_theme:
+            theme_colors.refresh()
+            if theme_colors.has_applied_theme:  # in case the theme file was deleted
+                theme_colors.apply_theme(theme_colors.applied_theme, notify_on_bg_change=False)
         for w in self.all_windows:
             if w.screen.color_profile.default_bg != bg_colors_before.get(w.id):
                 self.default_bg_changed_for(w.id)

kitty/colors.py

@@ -83,6 +83,18 @@ class ThemeColors:
                         found = True
         return found
 
+    @property
+    def has_applied_theme(self) -> bool:
+        match self.applied_theme:
+            case '':
+                return False
+            case 'dark':
+                return self.has_dark_theme
+            case 'light':
+                return self.has_light_theme
+            case 'no_preference':
+                return self.has_no_preference_theme
+
     @property
     def has_dark_theme(self) -> bool:
         return self.dark_mtime > -1