I discussed this issue briefly on #xubuntu-devel today. This issue does not affect the default Xubuntu session which has set a cursor size for a long time. It only affects Ubuntu 18.10 users using the plain Xfce session. (In fact, I had to create a new user to see this bug for myself in an Xubuntu 18.10 live ISO. Simply choosing "Xfce" after already logging in with "Xubuntu" was not sufficient.)
This bug will be fixed for Ubuntu 19.04 and never affected Ubuntu 18.04 LTS. ** Changed in: gtk+3.0 (Ubuntu) Status: Confirmed => Fix Committed ** Tags added: rls-cc-notfixing -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu. https://bugs.launchpad.net/bugs/1798861 Title: Tooltips flicker constantly in GTK3 applications Status in gtk+3.0 package in Ubuntu: Fix Committed Status in gtk+3.0 package in Debian: Unknown Bug description: Tooltips are flicker constantly (i.e. repeatedly shown and the hidden again) in GTK3 applications under XFCE. It is a regression in the recent GTK 3.24. This is the upstream report and fix: https://gitlab.gnome.org/GNOME/gtk/issues/1371 https://gitlab.gnome.org/GNOME/gtk/commit/9b7d886b723132eade2e76f3fd179cf81b7601f2 A workaround for XFCE is as follows: Open Settings Editor. Set xsettings -> Gtk -> CursorThemeSize to 16. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: libgtk-3-0 3.24.1-1ubuntu2 Uname: Linux 4.19.0-041900rc8-generic x86_64 ApportVersion: 2.20.10-0ubuntu13 Architecture: amd64 Date: Fri Oct 19 12:23:53 2018 InstallationDate: Installed on 2017-02-01 (624 days ago) InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gtk+3.0 UpgradeStatus: Upgraded to cosmic on 2018-10-18 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1798861/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp