Add documentation for horizontal scroll bars and fix some minor issues.

* buffer.c (scroll_bar_width, scroll_bar_height): Fix
doc-strings.
* window.c (Fset_window_scroll_bars): Fix doc-string.
(Fwindow_scroll_bars): Have it return what the doc-string says.

* window.el (window-full-height-p): Make it behave correctly for
minibuffer window.
(window-current-scroll-bars): Fix code.
(fit-frame-to-buffer): Use window-scroll-bar-height instead of
window-scroll-bars.
* frame.el (frame-current-scroll-bars): Fix doc-string.
* scroll-bar.el (toggle-horizontal-scroll-bar): New command.

* frames.texi (Scroll Bars): Describe use of horizontal scroll
bars.

* display.texi (Scroll Bars): Add description of horizontal scroll
bars and associated functions.
* frames.texi (Layout Parameters): Add horizontal scroll bar
entries.  Remove paragraph on "combined fringe widths".
* windows.texi (Window Sizes): Describe affects of horizontal
scroll bars on window layout and sizes.  Fix description of
window-full-height-p.
(Resizing Windows): Mention horizontal scroll bar.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/buffer.c b/src/buffer.c
index b46993a3cdb..80791a1fdb1 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5925,12 +5925,12 @@ in a window.  To make the change take effect, call `set-window-buffer'.  */);
 
   DEFVAR_PER_BUFFER ("scroll-bar-width", &BVAR (current_buffer, scroll_bar_width),
                      Qintegerp,
-                     doc: /* Width of this buffer's scroll bars in pixels.
+                     doc: /* Width of this buffer's vertical scroll bars in pixels.
 A value of nil means to use the scroll bar width from the window's frame.  */);
 
   DEFVAR_PER_BUFFER ("scroll-bar-height", &BVAR (current_buffer, scroll_bar_height),
                      Qintegerp,
-                     doc: /* Height of this buffer's scroll bars in pixels.
+                     doc: /* Height of this buffer's horizontal scroll bars in pixels.
 A value of nil means to use the scroll bar height from the window's frame.  */);
 
   DEFVAR_PER_BUFFER ("vertical-scroll-bar", &BVAR (current_buffer, vertical_scroll_bar_type),