Comment 3 for bug 1754855

Tried a couple things in CompizConfig Settings Manager -

1) Set Mate-panel to Above (always on top) in Window Rules. No change.
2) Excluded Mate-panel from decorations and shadows in Window Decoration. No change.

I also tried running an application (REAPER beta for Linux) that does not use GTK for menus and uses its own custom menu bar, and making it fullscreen using Compiz's Extra WM Actions. (This would also unredirect the application window.) That application's menu *does* respond to rollover at the top row of pixels.

It's as if Compiz is hiding mouse movement events from mate-panel on the very top pixel row of the screen, but is not for applications that are fullscreen, unredirected, and undecorated.