Bug 121583 sets a minheight on the tree's scrollbar to prevent it from affecting layout. But unfortunately that doesn't work if you set a CSS min-height on the scrollbar itself. Switching it back to the slider seems to fix the bug.
Note that I noticed this while browsing CSS Rules in DOM Inspector; without the patch, the position of the vertical splitter will move when the one of the scrollbars appears or disappears. (Do this in a clean profile so you don't have any persisted attributes to confuse matters!)
Assignee: nobody → neil
Status: NEW → ASSIGNED
Attachment #509406 - Flags: review?(iann_bugzilla)
Pushed changeset 8b9494bc2d2d to comm-central... a year ago ;-)
Status: ASSIGNED → RESOLVED
Closed: 8 years ago
Resolution: --- → FIXED
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