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Describe how window dividers can replicate vertical borders (Bug#27830)

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* doc/emacs/frames.texi (Scroll Bars): Describe how window
dividers can be used to replicate vertical borders when scroll
bars are disabled (Bug#27830).
* doc/emacs/frames.texi (Window Dividers): Mention their use
in replicating vertical borders.
This commit is contained in:
Martin Rudalics 2017-10-09 09:29:52 +02:00
parent e2150d994a
commit 62e5c119af
1 changed files with 20 additions and 1 deletions
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19
doc/emacs/frames.texi
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@ -1002,6 +1002,20 @@ when the entire buffer is visible.
The visual appearance of the scroll bars is controlled by the The visual appearance of the scroll bars is controlled by the
@code{scroll-bar} face. @code{scroll-bar} face.
@cindex vertical border
On graphical frames, vertical scroll bars implicitly serve to separate
side-by-side windows visually. When vertical scroll bars are disabled,
Emacs by default separates such windows with the help of a one-pixel
wide @dfn{vertical border}. That border occupies the first pixel column
of the window on the right and may thus overdraw the leftmost pixels of
any glyph displayed there. If these pixels convey important
information, you can make them visible by enabling window dividers, see
@ref{Window Dividers}. To replicate the look of vertical borders, set
the @code{right-divider-width} parameter of frames to one and have the
@code{window-divider} face inherit from that of @code{vertical-border},
@ref{Window Dividers,, Window Dividers, elisp, The Emacs Lisp Reference
Manual}.
@cindex Horizontal Scroll Bar @cindex Horizontal Scroll Bar
@cindex Horizontal Scroll Bar mode @cindex Horizontal Scroll Bar mode
On graphical displays with toolkit support, Emacs may also supply a On graphical displays with toolkit support, Emacs may also supply a
@ -1060,6 +1074,11 @@ window-divider-mode}.
customize the options @code{window-divider-default-bottom-width} and customize the options @code{window-divider-default-bottom-width} and
@code{window-divider-default-right-width}. @code{window-divider-default-right-width}.
When vertical scroll bars are disabled, dividers can be also useful to
make the first pixel column of a window visible which would be otherwise
covered by the vertical border used to separate side-by-side windows
(@pxref{Scroll Bars}).
For more details about window dividers see @ref{Window Dividers,, For more details about window dividers see @ref{Window Dividers,,
Window Dividers, elisp, The Emacs Lisp Reference Manual}. Window Dividers, elisp, The Emacs Lisp Reference Manual}.