SUMMARY This is not a Bug but in #snapcraft I was told to file it here to get help. When installing Kmag Snap on Debian Stable with Mate Desktop it has a small black mousepointer. Since I am using High Contrast (white on black) a black mousepointer with a 1px white border is very hard to see. Which file do I have to replace (either in host or snap) in order to get the mousepointer I want?
Unfortunately the cursor is hard-coded in the source. You would need to change the source code and recompile. The cursor color is in line 378, the outline color in line 376. https://cgit.kde.org/kmag.git/tree/kmagzoomview.cpp#n371