Make scroll-bar-adjust-thumb-portion customizable, adjust documentation.

* lisp/cus-start.el (all): Add scroll-bar-adjust-thumb-portion.

* src/xterm.c (syms_of_xterm): Adjust documentation for
scroll-bar-adjust-thumb-portion.

4 files changed, 16 insertions, 4 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 73e096adc5..4bd5ba43be 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2013-01-11  Jan Djärv  <[email protected]>
+
+	* cus-start.el (all): Add scroll-bar-adjust-thumb-portion.
+
 2013-01-13  Stefan Monnier  <[email protected]>
 
 	* jit-lock.el (jit-lock-debug-mode): New minor mode.
diff --git a/lisp/cus-start.el b/lisp/cus-start.el
index b954ed60ba..e1d4eb837c 100644
--- a/lisp/cus-start.el
+++ b/lisp/cus-start.el
@@ -513,6 +513,7 @@ since it could result in memory overflow and make Emacs crash."
 	     (x-use-underline-position-properties display boolean "22.1")
 	     (x-underline-at-descent-line display boolean "22.1")
 	     (x-stretch-cursor display boolean "21.1")
+	     (scroll-bar-adjust-thumb-portion windows boolean "24.4")
 	     ;; xselect.c
 	     (x-select-enable-clipboard-manager killing boolean "24.1")
 	     ;; xsettings.c
diff --git a/src/ChangeLog b/src/ChangeLog
index ce6ce861a7..31f119160f 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2013-01-11  Jan Djärv  <[email protected]>
+
+	* xterm.c (syms_of_xterm): Adjust documentation for
+	scroll-bar-adjust-thumb-portion.
+
 2012-12-31  Adam Sjøgren  <[email protected]>
 
 	* xterm.c (scroll-bar-adjust-thumb-portion): New variable to
diff --git a/src/xterm.c b/src/xterm.c
index cbae1bc4b0..26d40859ed 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -10789,10 +10789,12 @@ With MS Windows or Nextstep, the value is t.  */);
 
   DEFVAR_BOOL ("scroll-bar-adjust-thumb-portion",
                scroll_bar_adjust_thumb_portion_p,
-               doc: /* Non-nil means adjust the thumb in the
-scroll bar to be less likely to resize which looks better.
-Set to nil if you want the thumb to fill the whole scroll bar
-when the entire buffer is visible.  */);
+               doc: /* Adjust thumb for overscrolling for Gtk+ and MOTIF.
+Non-nil means adjust the thumb in the scroll bar so it can be dragged downwards
+even if the end of the buffer is shown (i.e. overscrolling).
+Set to nil if you want the thumb to be at the bottom when the end of the buffer
+is shown.  Also, the thumb fills the whole scroll bar when the entire buffer
+is visible.  In this case you can not overscroll.  */);
   scroll_bar_adjust_thumb_portion_p = 1;
 
   staticpro (&last_mouse_motion_frame);