Remove PROBLEMS section on double-buffering

* etc/PROBLEMS: Remove section on problems with double-buffering,
as apparently it's now no longer an issue (bug#30088).

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 4e4ec6d353d9d89c379f31bd262d09e400ff8e84..f95564454cb230d504d9f4ed74e476bbd0fde644 100644 (file)
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -574,21 +574,6 @@ For example, simply moving through a file that contains hundreds of
 thousands of characters per line is slow, and consumes a lot of CPU.
 This is a known limitation of Emacs with no solution at this time.
 
-*** Display artifacts on GUI frames on X-based systems.
-
-This is known to be caused by using double-buffering (which is enabled
-by default in Emacs 26 and later).  The artifacts typically appear
-after commands that cause Emacs to scroll the display.
-
-You can disable double-buffering by evaluating the following form:
-
-  (modify-all-frames-parameters '((inhibit-double-buffering . t)))
-
-To make this permanent, add it to your ~/.emacs init file.
-
-Note that disabling double-buffering will cause flickering of the
-display in some situations.
-
 *** Self-documentation messages are garbled.
 
 This means that the file 'etc/DOC' doesn't properly correspond