Submenu icon getting cut off on Firefox browser

Hi team i have added code for remove submenu icon getting cut off on Firefox browser on my local setup added a patch for it and tested on my local environment on firefox browser now icon is looking nice. Please review my code and patch file screenshot of apply patch filename submenu-icon-cutoff-patch.png is added please check.

verified patch #2 is reloved the issue for me. Thanks!

The patch is working. The icon is coming correctly on Firefox browser. Moving to RTBC.