Hi there.
I have noticed that whenever I get a notification (such as a song changing on Spotify), I am not able to scroll any more in my current window (such as Firefox). To get the scrolling working again, I need to change to another window, and then back again. I think that I am having an issue with with window activation. I have tried searching to see whether there is a fix for this problem, but cannot seem to find anyone else with the issue.
Does anyone have any ideas on how I can change this?

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Some more information about your exact Plasma version and distribution might be helpful, as well as what modifications you made to the original installation.