bug#32002: 24.4; Scroll bar start, end not correct

[martin rudalics]

> To clarify: this was after I managed to get the steppers to appear and I
> clicked on the up-stepper.

Can you extend the slider of a two-line window's scroll bar into the
other window's scroll bar when you remove the steppers?  We could
resolve the problem simply by not drawing a slider when the window
gets too small.  But there's no way of doing that IIUC.

> If I click in the whitespace that I mentioned (no steppers, no slider),
> nothing happens (the breakpoint is not triggered).

Since the widget is not drawn we won't get a scroll bar event.  So
this is normal.

martin