I hope that Notepad++ developers can address these issues for Linux users

That would be extremely unlikely as Notepad++ is a Windows app, it relies on the Windows environment. No support has ever been given by the developers to Linux users, but occasionally it seems a newer Notepad++ release or even Wine update may provide some benefit. In your case however the opposite seems to have occurred.

You haven’t mentioned if you are using a high dpi monitor. If so there is a setting in Notepad++ that provides more compatibility under these conditions in Windows. This is located under Preferences, Misc. Look for direct write/gdi rendering mode. I’ve no idea if this will help you, but if it does, please let us know.

Terry