Some applications don't have any window previews

[Caffeineix]

Issue:
Window previews are not generating for certain applications—mostly QT and Electron applications, but some GTK+ applications are affected as well.

Steps to reproduce:

1. Open dockx
2. Open one of the applications listed below
3. Hover over the window icon

QT applications tested: Prism Launcher, EasyEffects
Electron applications tested: Obsidian, VSCodium, Discord
GTK+ applications tested: xfce4-taskmanager, Mousepad, GIMP, Audacity
Other application tested: glxgears

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Operating system: EndeavourOS
Desktop environment: Xfce

[xuzhen]

I can not reproduce this issue.

Tried some of applications on your list with Debian+xfce/other WMs, and the preview function works correctly.
Also tried some of applications with Arch/EndeavourOS installed in VirtualBox, still no problem occurred.

[Caffeineix]

I've done some more testing, and it does appear to work on the main AUR package, which seems to be an older version containing #17, but doesn't seem to work on the dockbarx-git package.