Mouse events pass through pure Wayland windows (that use wl_shell)

[Hadrien]

  * When I run 'mpv', the video player, and I click on the main window with my mouse, the click goes through and select whatever window was behind.
  * The same thing happens if I build a SDL tutorial and start it with SDL_VIDEODRIVER=wayland.
  * The same thing happens if I build this Wayland tutorial: https://github.com/hdante/hello_wayland
  * The same thing with Jan Newmarch's Wayland tutorial examples.

These different cases lead me to believe that the problem lies in Gnome Wayland compositor and not in these programs.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.2-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.13.0-19.22-generic 4.13.13
Uname: Linux 4.13.0-19-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Dec 21 15:47:50 2017
DisplayManager: gdm3
InstallationDate: Installed on 2017-10-02 (79 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Confirmed in 18.04 too.

[Daniel van Vugt (vanvugt)]

Sounds like either an incorrect usage of wl_surface::set_input_region by the clients, or an incorrect default by gnome-shell.

Certainly the spec says it should be "infinite" by default:
  https://wayland.freedesktop.org/docs/html/apa.html#protocol-spec-wl_surface
So that should stop this from happening even with the simplest native Wayland clients.

[Daniel van Vugt (vanvugt)]

Also, the bug does not occur in as Weston login so it seems to be specific to Gnome Shell.

[Daniel van Vugt (vanvugt)]

OK, I have a fix on the way upstream: https://bugzilla.gnome.org/show_bug.cgi?id=790309

We'll try to get it into Ubuntu ASAP.

[Daniel van Vugt (vanvugt)]

The fix has landed upstream. It's due for release in mutter 3.26.3 ...
https://git.gnome.org/browse/mutter/commit/?h=gnome-3-26&id=294cceaeb8ecfd468132eff8af1f75c9d60ff21d

[Hadrien (psydk)]

Nice! Good job, Daniel.

I learned with one of your comment that the wl_shell interface is deprecated. After some search, it seems that zxdg_shell_v6 should be used instead?

[Daniel van Vugt (vanvugt)]

Yes and no :)

I believe the "z" prefix means that interface is still unstable and subject to change. So you might actually be better off staying with wl_shell which is "stable" and won't change. The fix for this bug will be in Ubuntu 18.04 soon hopefully, and I think it may probably land in 17.10 too, based on previous updates.

[Daniel van Vugt (vanvugt)]

mutter (3.27.91-1) experimental; urgency=medium

  * New upstream development release (LP: #1751070)
  * Bump minimum libgbm-dev to 17.1 and libdrm-dev to 2.4.83
  * Build-Depend on libcogl-dev (needed for build but shouldn't be…)
  * Cherry-pick bump-api.patch
  * Update package names for soname bump

 -- Jeremy Bicha <email address hidden> Thu, 22 Feb 2018 08:54:47 -0500