Ticket #8348: 8348_2.patch

_source/themes/default/theme.js

@@ -339 +339 @@
 {
         var container = this.container,
                 contents = CKEDITOR.document.getById( 'cke_contents_' + this.name ),
+                contentsFrame = CKEDITOR.env.webkit && this.document && this.document.getWindow().$.frameElement,
                 outer = resizeInner ? container.getChild( 1 ) : container;
 
         // Set as border box width. (#5353)
         outer.setSize( 'width',  width, true );
 
+        // WebKit needs to refresh the iframe size to avoid rendering issues. (1/2) (#8348)
+        contentsFrame && ( contentsFrame.style.width = '1%' );
+
         // Get the height delta between the outer table and the content area.
         // If we're setting the content area's height, then we don't need the delta.
         var delta = isContentHeight ? 0 : ( outer.$.offsetHeight || 0 ) - ( contents.$.clientHeight || 0 );
         contents.setStyle( 'height', Math.max( height - delta, 0 ) + 'px' );
 
+        // WebKit needs to refresh the iframe size to avoid rendering issues. (2/2) (#8348)
+        contentsFrame && ( contentsFrame.style.width = '100%' );
+
         // Emit a resize event.
         this.fire( 'resize' );
 };