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Terminal icon in window titlebar is stretched out over window control buttons
May 13, 2018
November 24, 2022
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As Ahmad Nassri points out this is an icon problem. Specifically please read this bug report carefully to confirm you are having the same problem.
If so review all the comments. Of particular interest is comment #8:
sudo apt install gnome-icon-theme # fixes sudo apt purge gnome-icon-theme # breaks
You can keep following this 8 month old bug report by subscribing to email to find out when a permanent fix is in.