Variable: x-gtk-use-system-tooltips
x-gtk-use-system-tooltips is an alias and customizable for
use-system-tooltips, defined in cider-mode.el.
Value
t
Documentation
Use the toolkit to display tooltips.
This option is only meaningful when Emacs is built with GTK+ or Haiku windowing support, and results in tooltips that look like those displayed by other GTK+ or Haiku programs, but will not be able to display text properties inside tooltip text.
Probably introduced at or before Emacs version 24.1.