Reset all windows positions

[slowtiger]

Since I've seen quite often some "my XY window has vanished/ is out of reach" recently, wouldn't it be great to have a single menu entry for just resetting this, without the need to reset the complete configuration?

[ematecki]

*In theory*, a window outside TVPaint's bounds should be shifted so that it becomes sufficiently visible for the user to move it where he want's.
A bug may have sneaked in there.

[slowtiger]

Sometimes I had palettes (namely the paper palette) moved outside the window and couldn't grab it, no matter how exact I tried to click. Funnily this solved itself one day.