Hi there, I also experienced this issue (Catalina 10.15.2, Geany 1.36). I have replaced my Geany with the version available here (n.b. the file name is the same as my original install but the contents are different...).

Its early days yet but I have scrolled around in some files that were problematic and the issue seems to have disappeared.

I found this download via the issue discussion here. That issue is on the face of it unrelated but fixing the screen painting seems to be a welcome side effect (maybe something to do with GTK changes on the Mac?).

Hope this helps!

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