Ticket #7984: 7984.patch

_source/plugins/autogrow/plugin.js

@@ -26 +26 @@
                                         newHeight;
 
                                 var delta =
-                                                // Delta height by checking scrollHeight.
-                                                ( CKEDITOR.env.ie && CKEDITOR.env.quirks ? body.scrollHeight - body.clientHeight
+                                                // Quirks calculation (including host page and document) requires 24 extra pixels (#7984).
+                                                ( ( CKEDITOR.env.quirks || doc.$.compatMode == 'BackCompat' ) && body.offsetHeight - body.clientHeight > 0 ? body.offsetHeight - body.clientHeight + 24
                                                                 : htmlElement.scrollHeight - ( htmlElement.clientHeight || htmlElement.offsetHeight ) )
                                                 // Negative scrollHeight (content reduced) is not supported in some browsers, figure it out by watching over the content size.
                                                 || ( body.clientHeight < lastContentHeight ? body.clientHeight - lastContentHeight : 0 );