Checking `browser_history.state.changing_hash` was not correct since
we were calling `select_id` on message list, which saves the narrow
state, before we set `browser_history.state.changing_hash` to `false`.
That means, it was not reliable to save the narrow state.
Also, it is possible that `save_narrow_state` is called after URL hash
is changed but before we render the new message list. That could result
in us saving the narrow state of the previous message list on the
new URL. That could lead to a weird bug where message list doesn't
change after clicking on a near link but user just gets scrolled
in the current message list as per the wrongly saved narrow state.
We fix it by only saving the narrow state when the URL matches the
filter set in the current message list.
When navigating "back" or "forward", the left sidebar state
should be restored.
Earlier, "more topics" expanded was not considered a distinct
state.
This commit makes it possible to correctly place you in the
"more topics" view or not, depending on where you were.
Fixes#29548.
It doesn't make sense for us to track a separate current filter when
it should just the be filter of current message list if there is one.
This will reduce possible confusion in the codebase where filter
returned by narrow_state is different from message_lists.current.
Operand is a confusing name because this
data structure has an attribute *called*
operand. This commit renames references to
this structure to "term", short for "search
term".
Aman Agrawal
Prakhar Pratyush
evykassirer