This commit prepares the frontend code to be consumed by webpack.
It is a hack: In theory, modules should be declaring and importing the
modules they depend on and the globals they expose directly.
However, that requires significant per-module work, which we don't
really want to block moving our toolchain to webpack on.
So we expose the modules by setting window.varName = varName; as
needed in the js files.
This is preparation for enabling an eslint indentation configuration.
90% of these changes are just fixes for indentation errors that have
snuck into the codebase over the years; the others are more
significant reformatting to make eslint happy (that are not otherwise
actually improvements).
The one area that we do not attempt to work on here is the
"switch/case" indentation.
Note from tabbott: This is a somewhat surprising feature to be adding
this late in Zulip's development, but the model we've had of what
narrows are easy to access via clicking around has meant that it was
fairly difficult to get into a narrow that didn't include the very
latest messages in that narrow.
Fixes#3465.
We are going to remove message_fetch.reset_for_narrow() soon,
but its callers probably still want to hide any scrolling
indicators, and we just let them do that directly.
This effectively changes a condition from `=== 0` to `<= 0`,
but that probably doesn't matter (and would only help). More
importantly, it just makes the code more consistent.
This mostly moves code from ui.js.
We change the arguments to `message_fetch.load_more_messages()`
to be `opts` with callbacks for `show_loading` and `hide_loading`.
We also defer starting the scroll handler until `message_fetch.js`
has been initialized.
Armaan Ahluwalia
Shubham Dhama
Aman Ghebreweldi
Tim Abbott
Steve Howell