fix(textangular): Fix focus issues in IE11

Fixes #443

lib/main.js

@@ -375,6 +375,7 @@ textAngular.directive("textAngular", [
 				// note that focusout > focusin is called everytime we click a button - except bad support: http://www.quirksmode.org/dom/events/blurfocus.html
 				// cascades to displayElements.text and displayElements.html automatically.
 				_focusin = function(){
+					scope.focussed = true;
 					element.addClass(scope.classes.focussed);
 					_toolbars.focus();
 				};
@@ -389,6 +390,7 @@ textAngular.directive("textAngular", [
 						$timeout(function(){
 							scope._bUpdateSelectedStyles = false;
 							element.triggerHandler('blur');
+							scope.focussed = false;
 						}, 0);
 					}
 					e.preventDefault();
@@ -533,7 +535,10 @@ textAngular.directive("textAngular", [
 				// the following is for applying the active states to the tools that support it
 				scope._bUpdateSelectedStyles = false;
 				/* istanbul ignore next: browser window/tab leave check */
-				angular.element(window).on('blur', function(){ scope._bUpdateSelectedStyles = false; });
+				angular.element(window).on('blur', function(){
+					scope._bUpdateSelectedStyles = false;
+					scope.focussed = false;
+				});
 				// loop through all the tools polling their activeState function if it exists
 				scope.updateSelectedStyles = function(){
 					var _selection;
@@ -547,6 +552,11 @@ textAngular.directive("textAngular", [
 				};
 				// start updating on keydown
 				_keydown = function(){
+					/* istanbul ignore next: ie catch */
+					if(!scope.focussed){
+						scope._bUpdateSelectedStyles = false;
+						return;
+					}
 					/* istanbul ignore else: don't run if already running */
 					if(!scope._bUpdateSelectedStyles){
 						scope._bUpdateSelectedStyles = true;
@@ -637,6 +647,7 @@ textAngular.service('textAngularManager', ['taToolExecuteAction', 'taTools', 'ta
 							toolbarScope._parent = scope;
 							toolbarScope.disabled = false;
 							toolbarScope.focussed = true;
+							scope.focussed = true;
 						});
 					},
 					unfocus: function(){
@@ -645,6 +656,7 @@ textAngular.service('textAngularManager', ['taToolExecuteAction', 'taTools', 'ta
 							toolbarScope.disabled = true;
 							toolbarScope.focussed = false;
 						});
+						scope.focussed = false;
 					},
 					updateSelectedStyles: function(selectedElement){
 						// update the active state of all buttons on liked toolbars