When using Meta+D to Peek at Desktop, it acts as a toggle between "peek" mode and show mode, requiring the user to activate the key combo twice when selecting something on the desktop behind an open window in order to drag/drop that selection onto the open window.

It would be helpful if the key combo were to act as a momentary switch: It would "peek" while holding down the key combo, so the selection could be made; Then when the keys are released, the window would be restored and the selection can be dragged/dropped onto it.


STEPS TO REPRODUCE
1.  Have an open window wanting a file from the desktop that is hidden behind the open window.
2. Press *and hold* the  Meta+D key combo to see the desktop and try to select the file.

OBSERVED RESULT
After a short Delay, you get a strobe effect as kwin quickly oscillates between peek and show mode for the desktop [EPILEPSY WARNING!], making it impossible to select the file.

EXPECTED RESULT
Meta+D could be held down while the file selection is being made and then released to show the window again with the selection ready to drag/drop onto the window.

To preserve the existing behavior the shortcut would continue to act as a toggle if released within the key repeat delay timer set up in settings > input devices > keyboard > hardware > delay:

However if held past that Delay time the behavior would change to momentary and continue to show the "peek" rather than oscillate back and forth between peek and show.