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 [EMAIL PROTECTED], 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 [EMAIL PROTECTED], specifies the width of the left
! fringe in pixels.
@end defvar
@defvar right-fringe-width
This variable, if [EMAIL PROTECTED], 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 [EMAIL PROTECTED], they appear outside the display
! margins. @xref{Display Margins}.
@end defvar
@defvar left-fringe-width
This variable, if [EMAIL PROTECTED], 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 [EMAIL PROTECTED], 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
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