On Tue, Oct 17, 2017 at 4:59 AM martin rudalics <rudalics@gmx.at> wrote:
Apparently you move the mouse to some strange glyph on your mode line.
Which one is that? Other mode lines elements do not seem to cause it.
Actually just before emailing this, I verified that I can reproduce this problem by even hover the mouse over "-master" (see the attached image), then over to the major mode lighter "Emacs-Lisp" and then back to "-master". The problem does not happen every time. But if I keep on moving the mouse hover between those 2 things.. may be a dozen times, this problem surely repeats.
Again, this problem happens only when x-gtk-use-system-tooltips is set to t.