** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => High
** Changed in: gnome-shell (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1816634
Title:
GNOME Shell consistently ignores mouse clicks in a particular app
window
Status in gnome-shell package in Ubuntu:
Triaged
Bug description:
https://gitlab.gnome.org/GNOME/mutter/issues/475
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This is similar in some ways to
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1181666 but
affects only the mouse, not the keyboard, and is consistent almost all
(99%+) of the time. This is happening for Ubuntu 18.04.2 LTS (bionic)
in the default desktop environment (Ubuntu). It also happens for the
GNOME and GNOME Classic desktop environments. The version of gnome-
shell is 3.28.3-0ubuntu0.18.04.4.
Our program is a blend of C# winforms (Mono) with embedded web browser
windows using Geckofx45 (mozilla version 45). Editing windows in the
program use HTML to display formatting and typescript/javascript code
to assist with popup dialogs and other editing help. Inside these
editing windows, left mouse clicks are essentially ignored.
Keyboarding still works fine as far as I can tell. Clicking on the
gear button inside the editing window fails to bring up the Styles
dialog more than 95% of the time. When the dialog does display, it is
always (100%) nonfunctional as the first click in it causes it to
close immediately.
Tracing the internal behavior of the code, it appears that clicking
the first time inside the editing (browser) window causes a series of
WM_FOCUS messages to be sent and the javascript to hook up a left
mouse click handler to a gear button displayed in the lower left
corner of the editing window. This is the expected behavior, and the
same as on other window managers. But then, on GNOME Shell only, a
series of WM_KILLFOCUS messages are sent immediately. This does not
happen for other window managers. (The main window receives a
WM_ACTIVATE message with the argument to make it deactivate.) Any
other left mouse clicks inside that window are ignored >95% of the
time, probably only when double clicking quickly enough to occur
before those messages to lose focus/deactivate are handled. (Right
mouse clicks are handled at a higher level and appear to function
normally.)
The program in question is called Bloom. The source code is available
at https://github.com/BloomBooks/BloomDesktop and prebuilt
debian/ubuntu packages are available at
http://packages.sil.org/ubuntu/ as bloom-desktop or bloom-desktop-
beta. After spending a few days looking at this problem, I've
reluctantly come to the conclusion that it must be a GNOME Shell bug
that I can't work around in our code. It's working fine in Microsoft
Windows and all the other Linux window managers that I've tested
(Unity, Cinnamon, KDE Plasma, MATE, XFCE, and LXDE).
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