It's not clear to me how to disable a window scroll bar.

I have frame scrollbars turned off:

(scroll-bar-mode -1)

I can enable a window scroll bar with

(set-window-scroll-bars (selected-window) nil 'right)

I expect the following to remove the scroll bar, but it doesn't. It only removes the fringe adjacent to the scroll bar.

(set-window-scroll-bars (selected-window) nil nil nil nil)

Checking (window-current-scroll-bars (selected-window)), it returns nil as expected. My understanding is that window-current-scroll-bars should tell me the dimensions of the window's scroll bar, returning nil if there is no scroll bar.

Maybe it's a frame scroll bar that somehow snuck in? Yet (frame-current-scroll-bars) returns nil as expected.

If I do something like C-h f or M-x after calling (set-window-scroll-bars (selected-window) nil nil nil nil), the scroll bar will disappear. Yet simply switching windows does nothing. The scroll bar remains.

I'm confused! Am I missing something?

I am using GNU Emacs 26.1 (build 1, x86_64-w64-mingw32) of 2018-05-30.

  • 2
    I can't reproduce this. (set-window-scroll-bars (selected-window) nil nil nil nil) removes the scroll bar as expected, starting from emacs -Q, on Emacs 27.0.50
    – Tyler
    Mar 19 '19 at 18:43

This appears to be a bug in Emacs. Although the bug fix has been pushed to the Emacs-26 branch, these changes either don't solve the problem or are not reflected in the latest Emacs 26 build, which is the version I am using (i.e. GNU Emacs 26.1 (build 1, x86_64-w64-mingw32) of 2018-05-30).

Trying the latest Emacs-27 development snapshot, the problem has been fixed, as indicated by @Tyler.

  • 1
    That fix will be available once emacs-26.2 is released.
    – rpluim
    Mar 21 '19 at 8:18

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