Re: not too happy with Emacs 21 vertical-line dragging when scrollbars present

[Richard Stallman]

    I think on those toolkits where it is possible to interfere with
    scrolling using the scrollbar, dragging the scroll bar sideways
    already resizes the windows.

Is that really true?  For which kinds of toolkits?

If this is how it is, it would be ideal to implement this for the
other remaining kinds of scroll bar, in a compatible way.