New answers tagged kwin
You can toggle desktop effects with Alt+Shift+F12.
I do not think it can be solved the exact way you propose. But you can "trap" the mouse pointer into the virtualbox window. You need to use a key to release the mouse before you can use it again on the desktop. See su.SE: How do I trap the mouse pointer within a VirtualBox Guest OS? Another solution could be to replace the modifier key Alt by Super, which ...
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