From f9ca524ef997bf3ddb3fed3c6fa7ee6ef4a7b12f Mon Sep 17 00:00:00 2001
From: Ed Sanders <esanders@wikimedia.org>
Date: Tue, 17 Nov 2015 17:42:47 -0800
Subject: [PATCH] Wikitext paste: Fail if result has no visible content

For example if '[[category:foo]]' is pasted.

Bug: T118191
Change-Id: I9c51846414dd6b885b33f1dc9076edadbc6464c4
---
 .../ve.ui.MWWikitextStringTransferHandler.js                  | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextStringTransferHandler.js b/modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextStringTransferHandler.js
index 79b5c6d635..5db946f201 100644
--- a/modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextStringTransferHandler.js
+++ b/modules/ve-mw/ui/datatransferhandlers/ve.ui.MWWikitextStringTransferHandler.js
@@ -106,6 +106,10 @@ ve.ui.MWWikitextStringTransferHandler.prototype.process = function () {
 			null // No sanitization, since HTML is from Parsoid
 		);
 
+		if ( !doc.data.hasContent() ) {
+			return failure();
+		}
+
 		// Attempt to undo outermost p-wrapping if possible
 		surface = new ve.dm.Surface( doc );
 		try {