Destroy previous Clipboard object before creating it again

As a new Clipboard object needs to be created again when its
corresponding button is rerendered the previous object is now explicitly
destroyed to ensure proper lifecycle management.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

js/views/callinfoview.js

@@ -298,12 +298,17 @@
 		 * Clipboard
 		 */
 		initClipboard: function() {
+			if (this._clipboard) {
+				this._clipboard.destroy();
+				delete this._clipboard;
+			}
+
 			if (this.ui.clipboardButton.length === 0) {
 				return;
 			}
 
-			var clipboard = new Clipboard(this.ui.clipboardButton[0]);
+			this._clipboard = new Clipboard(this.ui.clipboardButton[0]);
-			clipboard.on('success', function(e) {
+			this._clipboard.on('success', function(e) {
 				var $input = $(e.trigger);
 				$input.tooltip('hide')
 					.attr('data-original-title', t('core', 'Link copied!'))
@@ -316,7 +321,7 @@
 						.tooltip('fixTitle');
 				}, 3000);
 			});
-			clipboard.on('error', function (e) {
+			this._clipboard.on('error', function (e) {
 				var $input = $(e.trigger);
 				var actionMsg = '';
 				if (/iPhone|iPad/i.test(navigator.userAgent)) {

js/views/roomlistview.js

@@ -271,12 +271,17 @@
 		 * Clipboard
 		 */
 		initClipboard: function() {
+			if (this._clipboard) {
+				this._clipboard.destroy();
+				delete this._clipboard;
+			}
+
 			if (this.ui.clipboardButton.length === 0) {
 				return;
 			}
 
-			var clipboard = new Clipboard(this.ui.clipboardButton[0]);
+			this._clipboard = new Clipboard(this.ui.clipboardButton[0]);
-			clipboard.on('success', function(e) {
+			this._clipboard.on('success', function(e) {
 				var $input = $(e.trigger);
 				$input.tooltip('hide')
 					.attr('data-original-title', t('core', 'Link copied!'))
@@ -289,7 +294,7 @@
 						.tooltip('fixTitle');
 				}, 3000);
 			});
-			clipboard.on('error', function (e) {
+			this._clipboard.on('error', function (e) {
 				var $input = $(e.trigger);
 				var actionMsg = '';
 				if (/iPhone|iPad/i.test(navigator.userAgent)) {