AppChooser: read and save the last choice
last_choice: The app id that was selected the last time.
The private implementation will try to read the last choice for a
certain file type, and save the last choice in xdg-desktop-portal-kderc
,
with the format of <mimeType>=<choice>
.
Requires: xdg-desktop-portal-kde!179 (merged) and frameworks/kio!1274 (merged)
Edited by Fushan Wen