[BUGFIX] RTE: In IE, the pasting pad sometimes shows an error page

In IE, the pasting pad for plain text pasting sometimes shows an
error page.
Apparently, a timing issue.

Releases: master, 6.2
Resolves: #62658
Change-Id: Idb34ea6bc00d6020da637addee42cfd2db2d87f3
Reviewed-on: http://review.typo3.org/33758


Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>

typo3/sysext/rtehtmlarea/htmlarea/plugins/PlainText/plain-text.js

@@ -413,7 +413,8 @@ HTMLArea.PlainText = Ext.extend(HTMLArea.Plugin, {
 				this.buildButtonConfig('Cancel', this.onCancel)
 			]
 		});
-		this.show();
+		// Apparently, IE needs sometime before being able to show the iframe
+		this.show.defer(100, this);
 	},
 	/*
 	 * Handler invoked after the pasting pad iframe has been rendered