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Problem: Sometimes a window is closed accidentally by the user and recovering it again by restarting the app takes a lot of time and clicks, i.e., 3 to 10 seconds.

Solution: Make a kwin history plugin which will keep recording the app and the file it is using just like "recently used" in KDE menu and this plugin will be invoked by touching, say, left upper corner of the screen and will bring the recently closed windows' thumbnails like present windows plugin.

This may also improve user convenience as it would be like "favorites" since people tend to close and restart some apps like konsole and web browsers