Reset OS window class and name for new single instance OS windows

docs/changelog.rst

@@ -131,6 +131,8 @@ Detailed list of changes
 - Single instance: Preserve environment variables from invoking environment in
   newly created window (:disc:`8567`)
 
+- Single instance: Reset OS Window class and name in new single instance OS
+  windows (:disc:`8567`)
 
 0.41.1 [2025-04-03]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

kitty/session.py

@@ -273,6 +273,9 @@ def create_sessions(
     current_layout = opts.enabled_layouts[0] if opts.enabled_layouts else 'tall'
     ans.add_tab(opts)
     ans.tabs[-1].layout = current_layout
+    if args is not None:
+        ans.os_window_class = args.cls
+        ans.os_window_name = args.name
     if special_window is None:
         cmd = args.args if args and args.args else resolved_shell(opts)
         from kitty.tabs import SpecialWindow