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1141bfa888
There's this very edge-case issue which is: if you go to the top of
the page and narrow to something other than the top message, the
floating subject bar does not update.
Why? Well, the way that the narrowing code works is that it sets up
narrowing and then calls
select_message_by_id(target_id, {then_scroll: true});
so that our selected message is in the view.
This in turn calls select_message, which calls recenter_view as
appropriate. This usually causes a scroll action, which in turn causes
the floating recipient bar to be updated.
But when we're at the top of the page, recenter_view doesn't need
to scroll at all! So the bar remains un-updated. Here we explicitly
update it to guard against that case.
This fixes Trac #651.
(imported from commit 6633cc8a81aedcbb31b30d7c1f27816f8808c700)