Fringes

[Nick Roberts <nickrob@snap.net.nz>]

If a buffer uses the default left fringe width, the variable left-fringe-width
is nil while the function window-fringes returns information about the fringes
of a window.  So there appears to be no way to determine the fringe width of a
buffer that is not currently displayed.  I've noticed this problem because
gdb-ui.el uses window-fringes in gdb-put-breakpoint-icon.  Since the speedbar
now has no left fringe, if I expand the display of a watch expression in the
speedbar (an array, say), the breakpoint icon shifts from the fringe to the
display margin (because window-fringes uses the selected window by default,
the speedbar in this case).

Nick


Here's a suggestion/correction for the Fringes section of the lisp
manual.

(caution if applying diff - remove line with ^^^^^^)

*** display.texi.~1.188.~       2005-10-01 00:57:51.000000000 +1200
--- display.texi        2005-10-02 21:55:21.174050936 +1300
***************
*** 2730,2752 ****
  @node Fringe Size/Pos
  @subsection Fringe Size and Position

!   Here's how to control the position and width of the window fringes.

  @defvar fringes-outside-margins
! If the value is non-@code{nil}, the frames appear outside the display
                                      ^^^^^^
! margins.  The fringes normally appear between the display margins and
! the window text.  It works to set @code{fringes-outside-margins}
! buffer-locally.  @xref{Display Margins}.
  @end defvar

  @defvar left-fringe-width
  This variable, if non-@code{nil}, specifies the width of the left
! fringe in pixels.
  @end defvar

  @defvar right-fringe-width
  This variable, if non-@code{nil}, specifies the width of the right
! fringe in pixels.
  @end defvar

    The values of these variables take effect when you display the
--- 2730,2754 ----
  @node Fringe Size/Pos
  @subsection Fringe Size and Position

!   The following buffer-local variables control the position and width
! of the window fringes.

  @defvar fringes-outside-margins
! The fringes normally appear between the display margins and the window
! text.  If the value is non-@code{nil}, they appear outside the display
! margins.  @xref{Display Margins}.
  @end defvar

  @defvar left-fringe-width
  This variable, if non-@code{nil}, specifies the width of the left
! fringe in pixels.  A value of @code{nil} means to use the left fringe
! width from the window's frame.
  @end defvar

  @defvar right-fringe-width
  This variable, if non-@code{nil}, specifies the width of the right
! fringe in pixels.  A value of @code{nil} means to use the right fringe
! width from the window's frame.
  @end defvar

    The values of these variables take effect when you display the