gethin, that seems plausibly like it could suffer from the same problems
as #49579 -- if you have a menu open or a virtualbox window to a guest
or similar, the screensaver 'lock' command may not be able to lock the
That's why we recommend using the lock interface in the menus or
keyboard shortcuts, because both will either succeed easily or visibly
fail before you make the next step manually.
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Desktop contents displayed on resume, before lock screen is shown
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