Fix some ICO files not converting to PNG

Some ICO files are incorrectly identified as TARGA by libmagic file
utility, used to obtain the MIME type of the extracted icon from the
executable while creating a desktop entry using dynamic launcher portal.
They are then assumed to be already PNG, and therefore are not correctly
converted, which results in failure to validate the icon by the portal.

While this is a libmagic bug, workaround it by assuming that
"image/x-tga" MIME type also indicates ICO files.

See https://bugs.astron.com/view.php?id=723

Helps: #4402

Author: ignapk

bottles/backend/utils/manager.py

@@ -206,7 +206,9 @@ def extract_icon(config: BottleConfig, program_name: str, program_path: str) ->
                 os.remove(ico_dest)
 
             ico.export_icon(ico_dest_temp)
-            if get_mime(ico_dest_temp) == "image/vnd.microsoft.icon":
+            # Some ICO files are incorrectly identified as TARGA
+            # See https://bugs.astron.com/view.php?id=723
+            if get_mime(ico_dest_temp) in ["image/vnd.microsoft.icon", "image/x-tga"]:
                 if not ico_dest_temp.endswith(".ico"):
                     shutil.move(ico_dest_temp, f"{ico_dest_temp}.ico")
                     ico_dest_temp = f"{ico_dest_temp}.ico"