Huge extra thumb up for Mac and Linux support! Thank you!
Builds an runs nice on my Arch Linux system. There's a minor GUI glitch in the "Auswahl"-list: vertical height is too small. Msg from gtk:
(denise:4896): Gtk-CRITICAL **: 20:21:37.930: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GtkScrollbar
seems related to this.