Include more Thumbnailers in dolphin (or figure out a plugin based system for it)
https://github.com/flathub/org.kde.dolphin/issues/33
It's a bit similar to #1 i guess.
Do we want to compile every single ThumbCreator https://lxr.kde.org/search?_filestring=&_string=%3DThumbCreator into dolphin flatpak or do we want to implement a plugin system in which you just install the calligra flatpak and then you get thumbnails just working in dolphin?