bug#73082: 30; Inconsistent Stipple Support

[Eli Zaretskii <eliz@gnu.org>]

> Cc: Po Lu <luangruo@yahoo.com>
> From: JD Smith <jdtsmith@gmail.com>
> Date: Fri, 6 Sep 2024 17:58:02 -0400
> 
> (let* ((w (window-font-width))
>        (stipple `(,w 1 ,(apply #'unibyte-string (make-list (/ (+ w 7) 8) 186)))))
>   (insert "\n" (propertize (concat  (make-string 15 ?\s)
> 				    "THIS IS A TEST"
> 				    (make-string 15 ?\s))
>                            'face `(:background "red" :foreground "blue" :stipple ,stipple))))
> 
> Only some Emacs 30 builds correctly render this simple stipple.  There has been some progress on :stipple support recently, but it remains incomplete.  To my knowledge, the current situation for :stipple support in Emacs 30 is as follows:
> NS (partially working): Commit ef6ffbdc79 from last May provided a partial fix, but stipples are black and white only (bug#70712)
> Windows (working?): patched in June (bug#71159)
> PGTK (working): incorrect stipple display patched July, 2023 (bug#64969)
> GTK, non-Cairo (working): appears to be working correctly
> GTK + Cairo (not working uniformly): Stipples are reported to be missing with some Cairo builds of Emacs 30
> Other X11 builds (?): Unsure if these are supported (but suspect they are given the legacy of stipple)

The MS-Windows build of the emacs-30 branch here shows the display you
expected.