Update the release notes

diff --git a/README.in b/README.in
index e64f8772df8424a2529c380cad4b876a14514cfb..f43365f5ad3ea9b60eff2b68fe45f6e0e53fef6e 100644 (file)
--- a/README.in
+++ b/README.in
@@ -73,6 +73,15 @@ Patches should be in unified diff form. (The -up option to GNU diff)
 Even better are git-formatted patches. (Use git format-patch)
 
 
+Release notes for 3.12
+======================
+
+* GtkWidget had a hack where if opacity is 0.999 we set up an opacity
+  group when rendering the widget. This is no longer needed in 3.10,
+  and GtkStack doesn't use it anymore. It has been removed in 3.12.
+  GdStack is using it, so applications should be ported from GdStack
+  to GtkStack in 3.12.
+
 Release notes for 3.10
 ======================