Ticket #21460: 21460.patch

wp-includes/js/quicktags.dev.js

@@ -182 +182 @@
                 // listen for click events
                 onclick = function(e) {
                         e = e || window.event;
-                        var target = e.target || e.srcElement, i;
+                        var target = e.target || e.srcElement, visible = target.clientWidth || target.offsetWidth, i;
 
+                        // don't call the callback on pressing the accesskey when the button is not visible
+                        if ( !visible )
+                                return;
+
                         // as long as it has the class ed_button, execute the callback
                         if ( / ed_button /.test(' ' + target.className + ' ') ) {
                                 // we have to reassign canvas here