imports/activitymanager: Use PreviewJob::generated (QImage) for thumbnail

Kai Uwe Broulikrequested to merge
work/kbroulik/activity-import-image into master

Original commit message(s)

  • imports/activitymanager: Use PreviewJob::generated (QImage) for thumbnail

This skips the conversion of the thumbnail to a QPixmap. It consumes the QImage directly.

Reason for the change

Optimization

Test plan

Meta+Q, wallpaper still there as before

Merge request reports