Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  58fba521e0f22a9efdde850ffd9354a0f5e4a29a

Use jsdifflib for QUnit diff

Because QUnit's inline diff is terrible for large diffs,
especially when there are block whitespaces changes.

Change-Id: I786fb981b02777ede38c4bee261f9e32f8f908ed