use elementVisible less, fixes IE bug

src/Calendar.js

@@ -290,9 +290,7 @@ var Calendar = FC.Calendar = Class.extend(EmitterMixin, ListenerMixin, {
 
 
 	rerenderEvents: function() { // API method. destroys old events if previously rendered.
-		if (this.elementVisible()) {
-			this.view.flash('displayingEvents');
-		}
+		this.view.flash('displayingEvents');
 	},
 
 

src/Calendar.render.js

@@ -195,7 +195,7 @@ Calendar.mixin({
 			this.toolbarsManager.proxyCall('activateButton', viewType);
 		}
 
-		if (this.view && this.elementVisible()) {
+		if (this.view) {
 
 			// prevent unnecessary change firing
 			if (this.view.get('businessHourGenerator') !== this.businessHourGenerator) {
@@ -262,10 +262,10 @@ Calendar.mixin({
 		var view = this.view;
 		var scroll;
 
-		if (!this.ignoreUpdateViewSize && this.elementVisible()) {
+		if (!this.ignoreUpdateViewSize && view) {
 
 			if (isResize) {
-				this._calcSize();
+				this.calcSize();
 				scroll = view.queryScroll();
 			}