** Changed in: mutter (Ubuntu Noble)
Status: Incomplete => Invalid
** Changed in: mutter (Ubuntu Noble)
Milestone: noble-updates => None
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https://bugs.launchpad.net/bugs/2089843
Title:
Applications stop receiving touch updates when the finger moves
outside of the window
Status in mutter package in Ubuntu:
Fix Committed
Status in mutter source package in Noble:
Invalid
Status in mutter source package in Oracular:
In Progress
Bug description:
[ Impact ]
A touchscreen input sequence is supposed to "grab" onto the window
where the action started, so that even when moving the finger outside
of the window updates are still sent to it. Instead, as the finger
leaves the surface of the window, that stops receiving all touch
updates and does not even receive a finish event.
[ Test Case ]
0. Log in to a GNOME Wayland desktop session
1. Open the Nautilus file manager
2. Navigate to a directory with many files
3. Switch to the vertical "List View"
4. Start scrolling vertically with the touchscreen
5. While scrolling, let the finger leave the surface of the window to its
right
7. Verify that Nautilus keeps scrolling even with the finger outside the
window
[ Where problems could occur ]
mutter is the Wayland compositor library that provides graphics and inputs
for the GNOME desktop, thus is a critical component.
Problems could manifest with touch input not working anymore, or sudden
log-out if gnome-shell crashes.
The change is limited to touchscreen handling, and won't ever affect a system
without touchscreen.
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