Allow leading/trailing spaces in tab_activity_symbol

docs/changelog.rst

@@ -58,6 +58,8 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
   is meant to match over line breaks, you will need to match over both.
   (:iss:`3845`)
 
+- Allow leading or trailing spaces in :opt:`tab_activity_symbol`
+
 
 0.21.2 [2021-06-28]
 ----------------------

kitty/options/definition.py

@@ -932,7 +932,8 @@ opt('tab_activity_symbol', 'none',
     option_type='tab_activity_symbol',
     long_text='''
 Some text or a unicode symbol to show on the tab if a window in the tab that
-does not have focus has some activity.
+does not have focus has some activity. If you want to use leading or trailing spaces
+surround the text with quotes.
 '''
     )
 

kitty/options/utils.py

@@ -614,7 +614,7 @@ def tab_fade(x: str) -> Tuple[float, ...]:
 def tab_activity_symbol(x: str) -> Optional[str]:
     if x == 'none':
         return None
-    return x or None
+    return tab_title_template(x) or None
 
 
 def tab_title_template(x: str) -> str: