http://gambaswiki.org/bugtracker/edit?object=BUG.1589&from=L21haW4- Comment #6 by Benoît MINISINI: Richtext tooltips for GTK+ has been implemented in commit https://gitlab.com/gambas/gambas/commit/baa18e85220c3b7f77dbe6d8622265bc80a7c1e7. Benoît MINISINI changed the state of the bug to: Fixed.