KSycoca: ensure extrafiles are ordered
Test :
touch touch $HOME/.local/share/applications/mimeapps.list
touch $HOME/kde/usr/etc/xdg/mimeapps.list
To reproduce the bug and have 3 mimeapps.list files.
Before plasmashell would use one core constantly and become unresponsive.
After no more CPU wasted.
Edited by Méven Car