Make input fields dismiss their popups when the ... (#4579)

* Make input fields dismiss their popups when the ...

... fields loose focus (`blur`)

* Update simple.js

core/modules/editor/engines/simple.js

@@ -55,7 +55,8 @@ function SimpleEngine(options) {
 	// Add an input event handler
 	$tw.utils.addEventListeners(this.domNode,[
 		{name: "focus", handlerObject: this, handlerMethod: "handleFocusEvent"},
-		{name: "input", handlerObject: this, handlerMethod: "handleInputEvent"}
+		{name: "input", handlerObject: this, handlerMethod: "handleInputEvent"},
+		{name: "blur", handlerObject: this, handlerMethod: "handleBlurEvent"}
 	]);
 	// Insert the element into the DOM
 	this.parentNode.insertBefore(this.domNode,this.nextSibling);
@@ -133,6 +134,20 @@ SimpleEngine.prototype.handleFocusEvent = function(event) {
 	return true;
 };
 
+/*
+Handle a dom "blur" event
+*/
+SimpleEngine.prototype.handleBlurEvent = function(event) {
+	if(this.widget.editFocusPopup) {
+		$tw.popup.triggerPopup({
+			domNode: this.domNode,
+			title: this.widget.editFocusPopup,
+			wiki: this.widget.wiki
+		});
+	}
+	return true;
+};
+
 /*
 Create a blank structure representing a text operation
 */