incompatible change in XIMPreeditCallbacks

[Po Lu]

Alan Coopersmith <alan.coopersmith at oracle.com> writes:

> Unfortunately, there is no one left reviewing Xlib patches who knows how
> input methods work or what might be a breaking change, or who could write
> documentation of such changes.  We'd love for someone to step up and
> take on such work.

How about this?

diff --git a/specs/libX11/CH13.xml b/specs/libX11/CH13.xml
index 5ca59790..6be4f1c2 100644
--- a/specs/libX11/CH13.xml
+++ b/specs/libX11/CH13.xml
@@ -8045,7 +8045,11 @@ set to
 <symbol>XIMPreeditPosition</symbol>.
 When specified to any input method other than 
 <symbol>XIMPreeditPosition</symbol>,
-this <acronym>XIC</acronym> value is ignored.
+this <acronym>XIC</acronym> value is ignored.  Some Xlib implementations
+will allow this to be set when
+<symbol>XNInputStyle</symbol> is set to
+<symbol>XIMPreeditCallbacks</symbol>.  Behavior in that case is
+implementation defined.
 </para>
 <para>
 <!-- .LP -->