bug#20677: tooltips generate garbage

[Michael Heerdegen]

Hello Eli,

I see this problem, too.  Quickly tested your questions with my
configuration.

> Does Emacs clean up the display if you type "M-x redraw-display RET"
> after the tip pops down?

Yes.

>  What about covering the frame with the tip artifacts with another
> frame, then uncovering it -- does the frame get redrawn automatically,
> and does that remove the artifacts?

Yes, it does.  Switching to another frame also removes the artifacts.

> Finally, can you try setting x-gtk-use-system-tooltips to nil, and see
> if that makes the problem go away?

Yes, that helps.

Reverting 7927a4 as suggested somewhere else in this thread also fixes
the problem for me.


Michael.