bug#27091: Request: Toggle scroll bar on each window separately

[martin rudalics]

> I think this should be added to the documentation in the ELisp manual.

The doc-string of ‘set-window-buffer’ has this:

  Optional third argument KEEP-MARGINS non-nil means that WINDOW's current
  display margins, fringe widths, and scroll bar settings are preserved;
  the default is to reset these from the local settings for BUFFER-OR-NAME
  or the frame defaults.

The Elisp doc of ‘set-window-buffer’ has this:

     By default, this function resets WINDOW's position, display
     margins, fringe widths, and scroll bar settings, based on the local
     variables in the specified buffer.  However, if the optional
     argument KEEP-MARGINS is non-`nil', it leaves the display margins
     and fringe widths unchanged.

I can amend the last sentence.  What else do you want to add?

martin