Choosing a window to be put at the opposite side after tiling one doesn't work

[sergio-costas]

Describe the bug

When using Drag to tile a window to any of the sides of the screen, choosing another window in the windows icon list to put in the opposite side does nothing.

Steps To Reproduce

• Open two windows (for example, a terminal and Firefox), and ensure that both windows aren't maximized, nor tiled; ensure that both are "approximately at the middle of the screen, and with a non-full size".
• Move one of them to one side, forcing the tiling mechanism to trigger, to tile it to that half of the screen.
• After doing that, in the opposite side an icon representing the other window in the screen will be shown, representing which window do we want to tile on that side. Click on it.
• We expect that that other window will be tiled in that side, but it isn't.

Tested with only tiling-assistant extension enabled.

System Info:

• Distro (incl. version): Ubuntu 25.10 (it worked fine in older versions)
• GNOME Shell version: Gnome 48
• Extension version and from where (e. g. EGO, main branch...): downloaded from extensions.gnome.org.
• XOrg/Wayland: Wayland

Journalctl logs

Every time a window is moved to the side to be tiled, a message with the text "Error in size change accounting" does appear in journalctl.

[PJ-Singh-001]

This issue is still present in Ubuntu 25.10,
It was reported and Confirmed in Launchpad for Ubuntu 24.04.

Steps To Reproduce:

TEST 1: Does not work when using the touchpad or mouse...

1. Drag a window to the left (or right) edge of the screen (using the touchpad or mouse).
2. The window tiles (as expected).
3. Click one of the presented application icons (using the touchpad or mouse).
4. The selected application window does not get tiled and does not gain focus.

TEST 2: But it works when using the keyboard...

1. Drag a window to the left (or right) edge of the screen (using the touchpad or mouse).
2. The window tiles (as expected).
3. Using the keyboard Arrow Keys and Enter key, select one of the presented application icons.
4. The selected application window gets tiled and gains focus.

System Info:

• Distro (incl. version): Ubuntu 25.10
• GNOME Shell version: Gnome 49
• Extension version and from where:
  • Ubuntu deb package version: 53-0ubuntu1
  • Installed using apt install gnome-shell-extension-ubuntu-tiling-assistant
• XOrg/Wayland: Wayland

Journalctl logs:

I've added annotations to the Journalctl logs showing each step in TEST 1 and TEST 2, and the corresponding log output.
The "Error in size change accounting" seems to be normal, and is actually presented whenever the tiling functionality works correctly. When this error is not logged, the tiling functionality does not work.

$ journalctl -f
Nov 27 23:14:52 PS006 gnome-shell[2821]: Error in size change accounting.
Nov 27 23:15:01 PS006 CRON[11477]: pam_unix(cron:session): session opened for user root(uid=0) by root(uid=0)
Nov 27 23:15:01 PS006 CRON[11479]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Nov 27 23:15:01 PS006 CRON[11477]: pam_unix(cron:session): session closed for user root
Nov 27 23:15:11 PS006 gnome-shell[2821]: Error in size change accounting.

# TEST 1

# 1. Drag 1st window to edge.
# 2. Window tiles (as expected).
Nov 27 23:15:22 PS006 gnome-shell[2821]: Error in size change accounting.

# 3. Select 2nd window using touchpad.
# 4. Nothing happens. No journalctl entry; no error message logged.

# PREPARE FOR TEST 2

# Drag window to un-tile to prepare for second test.
Nov 27 23:15:29 PS006 gnome-shell[2821]: Error in size change accounting.

# TEST 2

# 1. Drag 1st window to edge.
# 2. Window tiles (as expected).
Nov 27 23:15:34 PS006 gnome-shell[2821]: Error in size change accounting.

# 3. Select 2nd window using the keyboard.
# 4. The 2nd window tiles (as expected).
Nov 27 23:15:37 PS006 gnome-shell[2821]: Error in size change accounting.

Also, reference Bug 2065136 on Launchpad from 2004 for additional information and a video of the issue:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-tiling-assistant/+bug/2065136.

Here is the video from that bug report demonstrating the issue:
https://launchpadlibrarian.net/728609680/Screencast%20from%202024-05-08%2007-31-54.mp4

[zpackrat]

Fedora 43, same issue as 1/29/26. system is up to date.

[binarydad]

Same issue here. Didn't know the arrow keys worked - it's just the clicking that doesn't work.