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KWin-move-win-directionally-script
KDE/Plasma script for moving the active window directionally (left/down/up/right) to another screen via keyboard shortcuts
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Re: " windows don't cascade if the mouse didn't move". That is annoying. For me, the exact behavior seems oddly app dependent. You can raise an issue on https://github.com/nclarius/KWin-window-positioning-scripts and discuss possible solutions, if any.
Completely aside: the keyboard shorts for moving windows between screens drive me nuts; they leave the mouse and focus behind; arrghh. I worked on a Kwin script to improve that (https://github.com/joedefen/KWin-move-win-directionally-script), but I could not get the mouse to follow the window to the new screen (and hence never submitted it to the KDE store); instead, I use a python script to do the job. KWin scripting is badly documented, and its API has intermittent coverage. KDE is mostly wonderful but has its annoyances.