bug#23925: 25.0.95; display broken when maximizing frame

[Glenn Morris <rgm@gnu.org>]

Eli Zaretskii wrote:

> What does that mean in practice, though?  We already have that option
> off by default, which should be enough of a hint to anybody that this
> option should not be turned on without a good reason.

Probably overkill, but eg:

--- a/configure.ac
+++ b/configure.ac
@@ -3164,6 +3164,13 @@ AC_SUBST(M17N_FLT_LIBS)
 HAVE_CAIRO=no
 if test "${HAVE_X11}" = "yes"; then
   if test "${with_cairo}" != "no"; then
+
+    AC_MSG_WARN([The Emacs Cairo port is experimental and unmaintained,
+and not recommended for use by non-developers.  There are several
+known display problems.  Please do not report display-related bugs in Cairo
+builds unless you are willing to fix them yourself.])
+    sleep 3
+
     CAIRO_REQUIRED=1.12.0
     CAIRO_MODULE="cairo >= $CAIRO_REQUIRED"
     EMACS_CHECK_MODULES(CAIRO, $CAIRO_MODULE)


(since AFAICS we have no-one who can work on these issues.)