Add the lxqt-support plug when creating Snap apps that use the kde-neon-6 extension.

[Kyuyrii]

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Request

Basically, if the chosen core is core24 and the chosen extension is kde-neon-6, I want the lxqt-support-core24 plug to be added and, consequently, the LD_LIBRARY_PATH, QT_PLUGIN_PATH environment variables and the necessary layouts.

This explains a few things: https://github.com/Kyuyrii/Snap-lxqt-support/blob/main/Instructions

The problem it solves

This would solve the problem of lxqt-plugin and Kvantum not being available in the apps.

The lxqt-plugin-core24 is the LXQT platform theme; without it, QT apps appear incorrectly in LXQT.

The platform theme is used to define fonts, font size, QT app colors, QT style...

Kvantum is a way to theme QT apps; Kvantum is even used by Lubuntu.

If you want to test lxqt-support, it is currently being used by several QT apps that I publish: https://snapcraft.io/publisher/kyuyrii

But currently it is necessary to copy the LXQT and Kvantum configuration files to the .config folder of the Snap app in question.

[bepri]

This seems reasonable to me. I welcome a PR adding this functionality :)

[Kyuyrii]

This seems reasonable to me. I welcome a PR adding this functionality :)

I opened a pull request, but I need help to know if the modification was done correctly, and if not, what else needs to be done.

#5917