This bug was fixed in the package mutter - 47.0-1ubuntu4.3
---------------
mutter (47.0-1ubuntu4.3) oracular; urgency=medium
[ Alessandro Astone ]
* debian: Update metadata for ubuntu/oracular branch
* Backport patch to fix touch drag&drop (LP: #1966635)
* Backport patch to fix touch grab (LP: #2089843)
* Backport patch to fix opening popups with touch input (LP: #2091159)
[ Yao Wei (魏銘廷) ]
* debian/patches: Synchronize touchscreen enabled state when adding it to
device mapper, which fixes suspend/resume related issue (LP: #2087831)
[ Daniel van Vugt ]
* Drop the previous fix attempted in 47.0-1ubuntu4.2 because verification
failed and rather than retry it right now we just want to unblock the
above fixes.
-- Daniel van Vugt <daniel.van.v...@canonical.com> Thu, 06 Mar 2025
14:06:50 +0800
** Changed in: mutter (Ubuntu Oracular)
Status: Fix Committed => Fix Released
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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 Released
Status in mutter source package in Noble:
Invalid
Status in mutter source package in Oracular:
Fix Released
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2089843/+subscriptions
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