Fix active_tab_foreground ignored in slant style

Fixes #4053

docs/changelog.rst

@@ -43,6 +43,10 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 - Allow deleting environment variables in :opt:`env` by specifying
   just the variable name, without a value
 
+- Fix :opt:`active_tab_foreground` not being honored when :opt:`tab_bar_style`
+  is ``slant`` (:iss:`4053`)
+
+
 
 0.23.1 [2021-08-17]
 ----------------------

kitty/tab_bar.py

@@ -181,6 +181,7 @@ def draw_tab_with_slant(
     before: int, max_title_length: int, index: int, is_last: bool,
     extra_data: ExtraData
 ) -> int:
+    orig_fg = screen.cursor.fg
     left_sep, right_sep = ('', '') if draw_data.tab_bar_edge == 'top' else ('', '')
     tab_bg = as_rgb(color_as_int(draw_data.active_bg if tab.is_active else draw_data.inactive_bg))
     slant_fg = as_rgb(color_as_int(draw_data.default_bg))
@@ -190,7 +191,7 @@ def draw_sep(which: str) -> None:
         screen.cursor.fg = slant_fg
         screen.draw(which)
         screen.cursor.bg = tab_bg
-        screen.cursor.fg = 0
+        screen.cursor.fg = orig_fg
 
     max_title_length += 1
     if max_title_length <= 1: