Comment 0 for bug 1292391

Steps to repoduce:
- Have 2 monitors/displays with different resolutions setup on your trusty installation. (In my case: Primary 1600x900 laptop screen and secondary 1920x1080 external monitor.)
- Lock the screen via shortcut.
- Remove one monitor. (In my case: Remove the external one.)
- Result: The display setup change is detected but the wallpaper on the remaining screen shows artifacts of improper resizing. Unlocking and locking the screen again will display the wallpaper properly resized without artifacts.
- Settings for background images in control center are set to resize for each screen (the 2nd option).