fix flicker of subject line in MessageHeader #1416
Merged
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MessageHeader rendered the subject line by default, and only after
MessageTitleView decided it was large enough to display the entire
subject line, the subject line was hidden again. This caused a noticable
flicker in vertical size during message rendering while navigating with
next/previous message buttons.
This commit flips the logic, only displaying the subject view once the
title view finds it can't display it all.