Created attachment 1977201 [details] Video of it happening Description of problem: Bug appears in: - Technology Preview of gimp 2.99.8 in RHEL9 - Built versions of gimp 2.99.16 and nightly from copr on Fedora: https://copr.fedorainfracloud.org/coprs/uriesk/gimp-nightly (spec file is an updated version of the one from RHEL) When i hover over an item in the toolbar for a second, just when the tooltip is supposed to appear, the highlight of it starts to flicker instead. If I hover over an entry in the menu or a dropdown that das a tooltip, the selection will flicker. This does not happen on every single tooltip, i.e. all the tooltips in the Test -> Testdialog work fine. How reproducible: Steps to Reproduce: 1. Install gimp technology preview on RHEL or gimp-2.99 from copr on Fedora (URL above) 2. Hover over a button in the toolbar or an menu item that has a tooltip Actual results: More likely then not, the selection / highlight will start to flicker and no tooltip appears. Expected results: Tooltip appears and no flickering. Additional info: Upstream bugreport: https://gitlab.gnome.org/GNOME/gimp/-/issues/9795