Shell: Qt WIndows start in floating mode and then break all tiling

[depletionmode]

Distribution (run cat /etc/os-release):

NAME="Pop!_OS"
VERSION="20.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://system76.com/pop"
SUPPORT_URL="http://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
LOGO=distributor-logo-pop-os

Related Application and/or Package Version (run apt policy pop-shell or provide the latest commit if building locally):

pop-shell:
Installed: 0.1.0~1589925465~20.04~ff5f374
Candidate: 0.1.0~1589925465~20.04~ff5f374
Version table:
* 0.1.0~1589925465~20.04~ff5f374 1001
1001 http://ppa.launchpad.net/system76/pop/ubuntu focal/main amd64 Packages
1001 http://ppa.launchpad.net/system76/pop/ubuntu focal/main i386 Packages
100 /var/lib/dpkg/status

Issue/Bug Description:
Some Qt (possibly Qt5/Python) apps start as floating windows which cannot be tiled/docked and once run, all subsequent applicaiton loads (no matter the application) start in floating mode.
pop-shell then breaks with windows semi-tiled all over.

Steps to reproduce (if you know):

Simply run some samples from here: https://github.com/pyqt/examples

Expected behavior:

These python/qt5 apps should tile like any other and not break.

Other Notes:

[timrichardson]

I can reproduce this by downloading this as main_helloworld.py and executing it:

from PyQt5.QtWidgets import *
app = QApplication([])
label = QLabel('Hello World!')
label.show()
app.exec_()

python3 main_helloworld.py

[timrichardson]

PS the easier way to recover is to restart the shell: alt-F2 r

[depletionmode]

Thanks for the recovery steps. At least I don't need to kill my shell manually any more to recover. :)
Would be great to get a fix though; I use pyqy5 for some custom tooling and my workflow is broken :(

[laichiaheng]

It also happens to Manjaro.

[mmstick]

Happens because of this:

JS ERROR: TypeError: name is null
ignore_decoration/<@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/window.js:96:52
ignore_decoration@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/window.js:96:35
decoration_show@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/window.js:79:18
ShellWindow@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/window.js:35:26
window_entity@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/extension.js:995:23
get_window@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/extension.js:263:27
on_window_create@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/extension.js:639:24
run@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/extension.js:160:22
wake/<@/home/mmstick/.local/share/gnome-shell/extensions/[email protected]/executor.js:29:24

[mmstick]

Try out the dev_focal branch

[depletionmode]

I can confirm that the fix works perfectly. Many thanks!