fix(iframe-view): can't turn pages after changing window size

src/managers/helpers/views.js

@@ -77,9 +77,8 @@ class Views {
 	}
 
 	destroy(view) {
-		if(view.displayed){
+		// Just destroy it.
-			view.destroy();
+		view.destroy();
-		}
 		
 		if(this.container){
 			 this.container.removeChild(view.element);

src/managers/views/iframe.js

@@ -6,7 +6,16 @@ import { EVENTS } from "../../utils/constants";
 import { Pane, Highlight, Underline } from "marks-pane";
 
 class IframeView {
+	/**
+	 * One section only have one View,
+	 * we can put them into the map to destroy the old one.
+	 */
+  static ViewMap = new Map();
 	constructor(section, options) {
+    const oldView = IframeView.ViewMap.get(section.href);
+    if (oldView) oldView.destroy();
+    IframeView.ViewMap.set(section.href, this);
+
 		this.settings = extend({
 			ignoreClass : "",
 			axis: undefined, //options.layout && options.layout.props.flow === "scrolled" ? "vertical" : "horizontal",
@@ -48,6 +57,7 @@ class IframeView {
 		this.highlights = {};
 		this.underlines = {};
 		this.marks = {};
+    this.loading = undefined;
 
 	}
 
@@ -158,7 +168,6 @@ class IframeView {
 				return this.load(contents);
 			}.bind(this))
 			.then(function(){
-
 				// find and report the writingMode axis
 				let writingMode = this.contents.writingMode();
 
@@ -382,7 +391,8 @@ class IframeView {
 
 
 	load(contents) {
-		var loading = new defer();
+    this.loading && this.loading.reject('cancel');
+		var loading = this.loading =  new defer();
 		var loaded = loading.promise;
 
 		if(!this.iframe) {
@@ -841,6 +851,14 @@ class IframeView {
 			this._height = null;
 		}
 
+		/**
+		 * Make sure the promise doesn't get stuck in pending,
+		 * This avoids queue blocking.
+		 */
+    if (this.loading) {
+      this.loading.reject('cancel');
+    }
+
 		// this.element.style.height = "0px";
 		// this.element.style.width = "0px";
 	}