Installing Kmail on an XFCE system fails to install qqc2-desktop-style

[geos-github]

Describe the bug
When installing kmail via pacman from the official Extra repository on a fresh Manjaro XFCE system, the required dependency qqc2-desktop-style is not installed. As a consequence, when selecting Settings/Add Mailbox in Kmail, nothing happens and an error message "module “org.kde.desktop” is not installed" is written to the console. Manually installing qqc2-desktop-style solve the issue.

To Reproduce
Steps to reproduce the behavior:

1. On a freshly set up Manjaro XFCE system, install kmail: sudo pacman -S kmail. Lots of dependencies are installed
2. launch kmail from a terminal's CLI
3. In kmail, select Settings/Add Mailbox
4. error message "module “org.kde.desktop” is not installed" is written to the terminal

Expected behavior
A window for mailbox setup comes up

Environment:

• XFCE (probably any non-KDE environment should do)
• Kernel Version: irrelevant
• Manjaro Version: latest
• Graphics Driver: irrelevant
• Device: Desktop PC

Additional context

sudo pacman -S qqc2-desktop-style resolves the issue.

Probably qqc2-desktop-style is missing as a dependency for the mail package or rather in one of its dependencies.

Maybe further applications are also affected.