Overlay conflicts with eglot #82
Description
I'm using (trying out) eglot with python-mode and it highlights the symbol-at-point with an overlay. I used symbol-overlay-put and other occurrences of the symbol highlighted (more clearly), but the keymap symbol-overlay installs didn't work. If I typed n the character was just inserted (eglot's overlay had a modification-hooks property if that matters), it didn't run symbol-overlay-jump-next.
I assumed it was because of conflicting overlays and added a 'priority 100 to the symbol-overlay overlay and it worked great. I don't know as there's a good solution (there was also a flymake overlay at point) but I think it would help if symbol-overlay included a priority in the overlays it uses and gives the user a symbol-overlay-priority user option to customize. That way we could resolve whatever conflicts we come across.