printing: Consistently include .desktop in the fallback app name
screencast: Fall back to desktop ID if we don't know the app name
appchooser: Fix a use-after-free
wallpaper: Handle errors storing images in the cache
email: Fix a crash if no addresses are provided
notification: Fix notifications for apps with no ID not appearing
screenshot: Report whether PickColor is implemented, if possible (this requires a sufficiently new xdg-desktop-portal at runtime)
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This update has been submitted for testing by amigadave.
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Works
This update's test gating status has been changed to 'failed'.