Bug 1460981 - Mouse events pass trough some windows
Mouse events pass trough some windows
Status: NEW
Product: Fedora
Classification: Fedora
Component: mutter (Show other bugs)
x86_64 Linux
unspecified Severity unspecified
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Assigned To: Florian Müllner
Fedora Extras Quality Assurance
Depends On:
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Reported: 2017-06-13 06:08 EDT by James Legg
Modified: 2017-08-08 04:27 EDT (History)
4 users (show)

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Attachments (Terms of Use)
Program reproducing bug (333 bytes, text/x-csrc)
2017-06-13 06:08 EDT, James Legg
no flags Details

  None (edit)
Description James Legg 2017-06-13 06:08:14 EDT
Created attachment 1287204 [details]
Program reproducing bug

Description of problem:
Under some circumstances when using Mutter as a Wayland compositor a window can stop responding to mouse events. Clicking on the window acts on the window behind it, or lands on the desktop if there is nothing there. Scrolling scrolls the content in the window behind the one under the mouse cursor. The mouse cursor changes as appropriate for its position on the window under the affected one.

Version-Release number of selected component (if applicable):
Mutter version 3.22.4, release 3.fc25.

How reproducible:
Occurs every time with the attached example.

Steps to Reproduce:
1. Compile the attached program with
    g++ $(sdl2-config --cflags --libs) click-through-window.cc \
    -o click-through-window
2. Run the application with
3. Right click on the window that appears

Actual results:
The window behind is focused and responds to the click.

Expected results:
The event it sent to the window which was clicked on, which in this case ignores it.

Additional info:
A message such as
    gnome-shell[1525]: Unknown surface ID 154 (from window 0xc00008 (window))
appears in the system log when the window is created.

The issue does not occur on Weston, which is why I suspect this is a bug in Mutter and not Xwayland or SDL2.

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