Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  c28773756e399ee40d2e496c488a6330551b6f99

Show proper button bar in editor on errors

Errors happen when the preview is visible, not the textarea, so if an
error occurs when saving, we should show preview's button bar.

Change-Id: I1d1222770fa5b498877ba5b917bee7e013a2e780