#5 X interface limits right button drag scrolling

[Simon Willcocks]

RISC OS style dragging of scrollbars in two dimensions is limited by the X interface because mouse events cannot move outside the display window area.

Try scrolling down a long html document in NetSurf using right-drag on the horisontal scrollbar.

Solution: Warp the X mouse to elsewhere in the window, so that the whole movement range for the mouse defined by ROLF can be accommodated within the X window. (The movement range will always be smaller than the screen area, for scrollbars at least.)