popup window doesn't disappear under Wayland #1522

Windows build number:

10.0.26200.0

Your Distribution version:

26.04

Your WSL versions:

WSL version: 3.0.3.0
Kernel version: 6.18.54.1-1
WSLg version: 1.0.79
MSRDC version: 1.2.7391
Direct3D version: 1.611.1-81528511
DXCore version: 10.0.26100.1-240331-1435.ge-release
Windows version: 10.0.26200.9711

Steps to reproduce:

run the ps script from PopupDemo.zip. This installs a fresh distro of Ubuntu 26.04, installs the packages required for demo, downloads a Qt example, builds the example, and runs the example. The QComboBox doesn't go away after an item is selected. This is shown in the video.

PopupDemo.zip

WSL logs:

weston.log

pulseaudio.log

stderr.log

wlog.log

WSL dumps:

No response

Expected behavior:

The QComboBox should not be visible after an item is selected.

Actual behavior:

The QComboBox remains visible even after an item is selected and it loses focus. This is what happens if you run the demo using the xcb platform ( basicdrawing -platform xcb) avoiding wayland. This also works correctly with Wayland on Ubuntu 26.04 under hyper-v.