bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[martin rudalics]

>      emacs -Q
>
> Expected results:
>
> - The Emacs frame has a vertical scroll bar displayed on the right with
>    the right edge of the scroll bar at the right edge of the frame. That
>    is, the right edge of the scroll bar is in the same pixel column as
>    the right edge of the title bar and menu bar. [In other words the
>    scroll bar and the title bar / menu bar intersect in the form an
>    inverted L.]
>
> Actual results:
>
> - The Emacs frame has a vertical scroll bar displayed on the right, but
>    the right edge of the scroll bar is "indented" from the right edge of
>    the frame. That is, the right edge of the scroll bar is a few pixels
>    to the left of (the pixel column of) the right edge of the title bar
>    and menu bar. [In other words the scroll bar and the title bar / menu
>    bar intersect in the form a T.]
>
> Additional information:
>
> - Other programs on my system display their scroll bar properly aligned.

I suppose its the hardcoded w = 16 in update_theme_scrollbar_width.

Does anything change if you play around with say

(set-frame-parameter nil 'scroll-bar-width 14)

or smaller values than 14?

martin