This bug seems to disappear after the final release of Kubuntu 18.04.
The issue might be closed but I can't find how to do that.
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https://bugs.launchpad.net/bugs/1756535
Title:
Kubuntu
** Package changed: ubuntu => kubuntu-meta (Ubuntu)
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https://bugs.launchpad.net/bugs/1756535
Title:
Kubuntu electron(nonnative) applications tray icon left mouse click
acts like
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
