Ticket #29485: 29485.3.diff

src/wp-admin/js/editor-expand.js

@@ -195 +195 @@
                                 return;
                         }
 
+                        // Bail on special keys.
+                        if ( key <= 47 && ! ( key === VK.SPACEBAR || key === VK.ENTER || key === VK.DELETE || key === VK.BACKSPACE || key === VK.UP || key === VK.LEFT || key === VK.DOWN || key === VK.UP ) ) {
+                                return;
+                        // OS keys, function keys, num lock, scroll lock
+                        } else if ( ( key >= 91 && key <= 93 ) || ( key >= 112 && key <= 123 ) || key === 144 || key === 145 ) {
+                                return;
+                        }
+
                         cursorTop = offset.top + editor.iframeElement.getBoundingClientRect().top;
                         cursorBottom = cursorTop + offset.height;
                         cursorTop = cursorTop - buffer;