Ran into this bug(?) while trying to recreate the Unity drag to unmaximize feature. I was originally trying to use libtaskmanager's "requestMove" function, but I've since tested with the global shortcut and it also doesn't work.

You can quickly test with:

sleep 5; qdbus org.kde.kglobalaccel /component/kwin invokeShortcut "Window Move"

First run the command, then hold the LeftButton down until the shortcut is activated.

You'll notice the mouse moved to the center of the window, but the window will not follow the mouse. Nor will LeftClicks do anything anywhere on the screen. The mouse can still be moved around, but mouse clicks do nothing. If you release the mouse the window quickly moves to where you released it. Mouse clicks are still not responsive until you press Space (accept move) or Esc (cancel move).



I broke down the function calls here:

* https://github.com/kotelnik/plasma-applet-active-window-control/issues/30#issuecomment-364255622

The taskmanager widget calls `performMouseCommand(Options::MouseMove, ...)`

* https://github.com/KDE/kwin/blob/2e868c50df0aab40e4814724ee090ded6bd9072e/events.cpp#L1168
* https://github.com/KDE/kwin/blob/master/abstract_client.cpp#L998

while it seems the global shortcut calls `performMouseCommand(Options::MouseUnrestrictedMove, ...)`

* https://github.com/KDE/kwin/blob/d3aa33b51bd635008b519f565bdf0492e1531090/kwinbindings.cpp#L67
* https://github.com/KDE/kwin/blob/a0c91c6e19fec54054d1d6684d7c7a8ec0f1688c/useractions.cpp#L1710
* https://github.com/KDE/kwin/blob/a0c91c6e19fec54054d1d6684d7c7a8ec0f1688c/useractions.cpp#L1095

AbractClient uses almost the same logic for both though

* https://github.com/KDE/kwin/blob/master/abstract_client.cpp#L998