Opera browser leaves ghost image on desktop

Describe the bug
When you move a tab from Opera, Bettersnap leaves a ghost image of it on the desktop. See image

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):

If applicable, add screenshots to help explain your problem. (You can just paste or drag them here)

Device information:

  • Type of Mac:
  • macOS version:
  • BetterTouchTool version:

Additional information (e.g. StackTraces, related issues, screenshots, workarounds, etc.):

Note: Before bug reporting, please make sure you have the latest version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS Console.app from the "User Diagnostic Reports" section.

unfortunately that means there is a bug in Opera which makes it not respond correctly to external resizing events ;-(

Most likely this can only be solved by Opera, but I'll have a look!