Observation on Ubuntu 18.04 : - All work good on Xorg session - Problem only affect Wayland session - Classic windows with traditional decoration (chromium, pidgin, inkscape, ...) accept middle-click action - GTK3 apps with Headerbar decoration who use CSD (Client Side Decoration) ignores middle-click - Don't know why, but Evolution 3.28.1-2 ignores middle-click too (but have traditional decoration !)
Freedesktop talk about that since December 2016 : https://lists.freedesktop.org/archives/wayland- devel/2016-December/thread.html#32028 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1698083 Title: Middle-click titlebar actions (like maximizing vertically) don't work in Wayland sessions Status in GTK+: Confirmed Status in gnome-shell package in Ubuntu: Confirmed Status in gtk+3.0 package in Ubuntu: Confirmed Status in mutter package in Ubuntu: Confirmed Bug description: In Gnome Tweak Tool you can configure vertical maximizing for: Windows > Titlebar Actions > Middle-Click However this feature seems to get ignored in Wayland sessions (it just maximizes fully instead). It only works correctly in Xorg Gnome sessions. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: gnome-shell 3.24.2-0ubuntu6 ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15 Uname: Linux 4.10.0-22-generic x86_64 ApportVersion: 2.20.5-0ubuntu4 Architecture: amd64 Date: Thu Jun 15 14:46:04 2017 DisplayManager: lightdm InstallationDate: Installed on 2017-05-03 (43 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170502) SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/gtk/+bug/1698083/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
