SUMMARY Not sure if this is a Firefox or KWin issue, but attempting to tile a Firefox Wayland window (with shift+drag) *sometimes* does not work*. The tiling indicator shows up, but at the end of the drag, it stays where it was immediately before releasing mouse left. This only happens when I launch Firefox with MOZ_ENABLE_WAYLAND=1. Using just "firefox" launches it in XWayland mode, which does not have that issue. * I found a WORKAROUND, which might help resolving that issue: After the window fails to tile, switching to another virtual desktop, and then back to the original one, gets the window to tile properly. STEPS TO REPRODUCE 1. Enable custom tiling 2. Start Firefox in Wayland mode with MOZ_ENABLE_WAYLAND=1 firefox 3. Shift+drag the firefox window to any desired custom tile, until the tiling indicator appears 4. Release mouse left, observe how the window did not tile. 5. If that did not trigger the bug, try again on a different tile. OBSERVED RESULT The window does not tile to the desired tile, instead it just keeps its position and dimensions as they were immediately before releasing mouse left. EXPECTED RESULT After releasing mouse left, the window should tile properly to the desired tile. SOFTWARE/OS VERSIONS Linux/KDE Plasma: 6.4.11-arch2-1 (64-bit) / 5.27.7 KDE Frameworks Version: 5.109.0 Qt Version: 5.15.10 ADDITIONAL INFORMATION Attached a screen capture of the bug and its workaround.
Sorry the video is too heavy and attachment creation failed, you can view and download it here: https://kdrive.infomaniak.com/app/share/356870/a7b56ee8-172e-4d48-b444-1358be40abfb
I'm experiencing this issue too. I'm not a fan of having to fall back on older technologies like X11/XWayland. I'm running Plasma 6.3.4 and hope that Plasma 6.4 will resolve this tiling bug.