Set "use wallpaper from theme" broken for local themes

[stefonarch]

Expected Behavior

Wallpaper should change

Current Behavior

Wallpaper remains the same, or if unset always black screen with any theme/wallpaper combination.

Possible Solution

Steps to Reproduce (for bugs)

1. Copy one or more themesfrom /usr/share/lxqt/themes to ~/.local/share/lxqt/themes
2. Select "Use wallpaper from theme" and select one of those theme
3. no wallpaper change

System Information

• PcManFm-qt version:git, all<

EDIT: updated for reproducing

[tsujan]

PcManFm-qt version:git, wip_qt6

→ lxqt/lxqt-build-tools#77 (comment)

[stefonarch]

It's broken also in qt5.

I found the reason why lxqt-config didn't set wallpapers here:

I use a symlink ~/.local/share/lxqt/themes → ~/git/lxqt/lxqt-themes/themes for testing modified themes and PRs.

Using the non local themes it works as expected, but it's still an issue for local themes where "use wallpaper from theme" will never work.