This function was introduced in
99d1c5a1f3 and always has the opposite
value from what its name suggests. It worked OK because the caller
also expected it to have an incorrect value.
It's cleaner in this context to just use the `stream_id` helper, so
just delete the bad code and use that.
Fix the docstring comment having been incorrectly pushed down while
we're addressing this.
For compose state variables `last_focused_compose_type_input` and
`message_type` that are assigned non-boolean values on user interaction,
`undefined` is the semantically better choice than `false` for
initialisation, to avoid incorrect boolean implications.
This is a prep commit for the next commit, which will quote a message
into the last focused compose type textarea, which we track in a new
`compose_state` variable in this commit.
Tim Abbott
N-Shar-ma
Anders Kaseorg