1. Click the pencil to edit an existing Flow board header.
2. Click Preview.

Result: the previewed text has an additional 200px right margin that isn't in the actual header.

The div for the preview has style="flow-board-header flow-preview", and flow-board-header has 200px right margin, but we're already in the flow-board-header. So either don't nest, or don't style.

Version: master
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=67629