Mouse cursor hides automatically after few seconds if text field is under it. When I use touchpad or mouse, this is usually not a problem because it appears again if I try to move it.

But when I move mouse cursor using my graphics tablet, KDE does not detect mouse cursor movements, and hides it even if I actively using it in text editor. Only way to unhide is to either touch the tablet surface (which would be like clicking blindly) or move the mouse cursor out of the text field (or I can slightly move it with touchpad or mouse, but it is very inconvenient when I'm holding stylus).

When I use stylus to move mouse cursor, I can see events in /dev/input/mice. My tablet does have "stylus" device in "Virtual core pointer" section according to xinput. So I do not know why KDE ignores its activity, perhaps it monitors only relative motion events. I use Huion tablet but somebody with Wacom tablet have exactly the same issue( https://askubuntu.com/questions/967665/stop-kde-plasma-hiding-mouse-cursor-when-typing ).

The problem can be reproduced in any KDE text editor, Kate, Kwrite, KDevelop, etc., so I'm not sure if I have chosen correct "product" for this bug, since it is not limited to Kate. But it is KDE-specific because does not happen in Firefox and other non-KDE software.