The default label for empty narrows depends on whether it's a
stream/topic narrow or a PMs narrow.
We leave some default text in compose.hbs for reply label
because it take some time for the js to display the
correct label.
We move compose from being a part of message feed to
being a part of middle column which is a common parent of recent
topics and message feed. This allows us to use a common compose
box for both the views. Fortunately, compose actions were
independent of this change so there weren't any evident
side effects.
Fixes#17543
The 'reply' button shows the stream>topic or recipient(s) of the
selected message, for better UX. It also expands to fill the
remaining horizontal space in the button bar -- this should help make
it easier for new users to figure out how to reply.
Finally, it uses "Message" instead of "Reply", to better match the
compose box.
Fixes#17940.
Tim Abbott
Aman Agrawal
Ken Clary