Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  5ee7b12119c8c63a130b7c5d0614e26e322bf5c3
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ve.dm.DocumentSlice does not extend ve.Node

Change-Id: I11d28d6eb1c7db1d6b5796ec36c8e9a6f46b7c9e