smplayer cannot drag window by clicking on the black bar (status bar) at the bottom of the window.

smplayer 17.3.0~ds0-1
plasma-desktop 5.9.4-0ubuntu1
on Kubuntu zesty

At here the SMPlayer can be dragged from the status bar:

- the first click will give the focus to the window
- the second click and hold will change the mouse cursor and it is possible to move the window

$ smplayer -v
This is SMPlayer v. 17.4.0 (revision 8495) running on Linux

$ plasmashell -v
plasmashell 5.9.4