Commit Graph

297 Commits

Author SHA1 Message Date
Anders Kaseorg d72423ef21 eslint: Replace empty-returns with consistent-return.
Instead of prohibiting ‘return undefined’ (#8669), we require that a
function must return an explicit value always or never.  This prevents
you from forgetting to return a value in some cases.  It will also be
important for TypeScript, which distinguishes between undefined and
void.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-09-25 15:17:59 -07:00
Anders Kaseorg b9acc5ee9a message_scroll: Rename actively_scrolling() to is_actively_scrolling().
It would conflict with the actively_scrolling variable after migration
to an ES6 module.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-09-25 15:12:24 -07:00
Priyank Patel b7998d3160 js: Purge people module from window. 2020-09-01 19:55:58 -07:00
Anders Kaseorg 6ec808b8df js: Add "use strict" directive to CommonJS files.
ES and TypeScript modules are strict by default and don’t need this
directive.  ESLint will remind us to add it to new CommonJS files and
remove it from ES and TypeScript modules.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-31 22:09:46 -07:00
YashRE42 b4891a5841 navbar: Rename tab_bar to message_view_header.
Prior to commit eb4a2b9d4e the center
area of the navbar was based on a structure that appended crumbs or
"tabs" as <li>s, forming a tab_bar and a tab_list.

However, in eb4a2b9d4e we apply a new
style and structure to the navbar which lets go of the convention of
tabs. Hence, we'd like to purge the tab_bar and tab_list labels from
our code base.

We purged tab_list in 1267caf5009118875f47fdafe312880af08024e1.

This commit purges tab_bar, it includes:
- A blanket search and replace of tab_bar with message_view_header.
- Splitting a single line comment in
  tab_bar.js / message_view_header.js.
- The renaming of tab_bar.js to message_view_header.js.
- The renaming of tab_bar.hbs to message_view_header.hbs.
- A blanket search and replace of tab_data with
  message_view_header_data.
- Replacing the single occurrence of tabbar with message_view_header
  (it was within a comment.)
2020-07-30 16:23:13 -07:00
Aman Agrawal b34d46e00b css: Rename #home id to #message_feed_container. 2020-07-28 16:33:32 -07:00
Aman Agrawal 0859a91b14 hashchange: Go through hashchange to narrow to All messsages.
We should not allow every function who wants to narrow to All
messages to come up with their own method to do so. This
commit makes existing such functions use hashchange library to
do so.

Remove click event on All message button, it already contains
an <a> tag which navigates correctly.
2020-07-28 16:33:32 -07:00
Anders Kaseorg e3b3df328d eslint: Replace sort-imports with import/order.
import/order sorts require() calls as well as import statements.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-24 09:42:56 -07:00
Anders Kaseorg 498fe285fa js: Access ‘disabled’ as a property, not an attribute.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-22 12:20:23 -07:00
Anders Kaseorg 96dcc0ce6e js: Use ES6 object literal shorthand syntax.
Generated by ESLint.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-21 12:42:22 -07:00
Anders Kaseorg b65d2e063d js: Reformat with Prettier.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-17 14:31:25 -07:00
Anders Kaseorg 8046b6477a js: Remove extra consecutive spaces.
Prettier would do this anyway, but it’s separated out for a more
reviewable diff.  Generated by ESLint.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-17 14:31:25 -07:00
Anders Kaseorg 883e2fd325 js: Remove inner spacing from object literals.
We’re configuring Prettier with bracketSpacing: false.  Generated by
ESLint.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-17 14:31:25 -07:00
Anders Kaseorg a20c12366f js: Use inside variant of IIFE wrappers.
Prettier would do this anyway, but it’s separated out for a more
reviewable diff.  Generated by ESLint.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-17 14:31:25 -07:00
Anders Kaseorg 6924d501bc js: Indent case clauses in switch statements.
Prettier would do this anyway, but it’s separated out for a more
reviewable diff.  Generated by ESLint.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-17 14:31:25 -07:00
Anders Kaseorg f3726db89a js: Normalize strings to double quotes.
Prettier would do this anyway, but it’s separated out for a more
reviewable diff.  Generated by ESLint.

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-17 14:31:24 -07:00
Anders Kaseorg e014ea966a eslint: Enable comma-dangle for functions.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-03 16:55:51 -07:00
Anders Kaseorg a79322bc94 eslint: Enable prefer-arrow-callback.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-03 16:55:50 -07:00
Anders Kaseorg b0253c5a2e eslint: Enable arrow-parens.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-07-03 16:53:39 -07:00
Ryan Rehman c7e39ef090 narrow: Move the top of narrow notices to `message_scroll.js`.
We refactor these 2 notices to match with the loading indicators,
thus they have been moved to `message_scroll.js`.

After a successful message fetch, we have logic to decide whether
we want to display the notices and also whether we want to hide
the loading indicators (which are already displayed).

We also conservatively hide the notices similar to the indicators
every time we narrow.
The only exception is that we show the history limit notice on
deactivating the narrow (visiting `home_msg_list`).
2020-06-16 00:21:21 -07:00
Ryan Rehman a630f291b9 message view: Refactor top loading indicators.
This commit makes the `loading_older_messages_indicator` similar
to the `loading_newer_messages_indicator`.
Now all the decisions about whether to show a loading indicator
will be made from the `fetch_status` API. We still hide the
indicators everytime the view is changed, as explained in the
previous commit.
2020-06-15 22:26:35 -07:00
Ryan Rehman e0b1fdb81c message view: Show home view bottom loading indicators.
As explained in 67053ff479,
multiple message fetches may be taking place at the same time.
So some other narrows / the home message list's indicator might
get shown for the current narrow.

This commit moves the updation of the indicators display logic
to the `fetch_status` API.
Now the `loading_newer_messages_indicator` gets displayed along
with the `loading_newer` = true updation for that narrow's message
list, i.e. just before we send the API request. But only if the
message list we are fetching matches with our current message list.

The same indicator is hidden similarly, along with the
`loading_older` = false updation for that narrow's message list,
i.e. just after the success response is recieved. But only if
the message list whose data we recieved  matches with our current
message list.

Also the indicators are hidden everytime we activate narrow
or deactivate narrow (`home_msg_list`). And on entering
`narrow.activate` we fetch for it's messages so they get
displayed again, if need be.
This is the reason `message_scroll.hide_indicators();` was
moved to a location above `fetch_messages`.

Fixes #15374.
2020-06-15 22:25:41 -07:00
Ryan Rehman 542a3dea77 minor: Refactor the top of narrow notices.
The changes made here are as follows:
* We rename `show_history_limit_message` and `hide_history_limit_message`
  to `show_history_limit_notice` and `hide_history_limit_notice`
  respectively.
* We rename `hide_or_show_history_limit_message` to
  `update_top_of_narrow_notices` as now this function is responsible
  for updating the history limit notice as well the end of results
  notice.
* We extract 2 functions responsible for hiding and showing the end
  of results notice, similar to that of the history limit notice.
  All instances of `$(".all-messages-search-caution").hide();` are
  replaced with the call of `hide_end_of_results_notice` function.
2020-06-14 11:06:54 -07:00
Ryan Rehman e0b1096253 narrow: Show streams:all notice only after "oldest" is found.
The streams:all advertisement notice in search should only appear
after all results have been fetched to indicate we've gotten to the
beginning of the target feed.

The notice gets hidden at the start of `narrow.activate` and is
shown just after we've fetched an older batch of messages if the
"oldest" message has been found.
Previously it would get displayed after the first fetch which
takes place from `narrow.activate`. Thus we move this logic to
`notifications.hide_or_show_history_limit_message` which gets
called after a successful message fetch.

Since the home message view contains all the messages we are not
required to display this notice. However if it is already shown
we hide it as a part of `handle_post_narrow_deactivate_processes`.

To accomplish this we need to add `has_found_oldest` key to the
`fetch_status` API.
We also removed the `pre_scroll_cont` parameter as this was it's
only use case and is now redundant.
2020-06-14 11:06:54 -07:00
Tim Abbott a1259c2521 narrow: Hide loading indicators unconditionally before setting state.
Before 77a26d41ae, there was only one
loading indicator (at the top of the page), so the if/else logic for
hiding loading indicators was correct, if confusing.  Since we've now
added a new bottom-of-page loading indicator, it's important to have
the logic correctly reset the state to hide all existing loading
indicators on narrowing, and then just render the ones needed/desired
by the current view.

Combined with similar code in `narrow.deactivate`, this achieves the
goal that we correctly update loading indicator state when switcing
views.
2020-06-14 09:58:23 -07:00
YashRE42 6506447bf1 navbar: Only set searchbox text when displaying the searchbox.
Previously, the navbar failed at managing the searchbox text state in
cases where, eg, the user performs navigation by browser history.

This commit resolves the issue by ensuring that the searchbox text is
only (and always) set when the searchbox is made visible, and as such
there is no "state" to manage and we will always display the correct
text.

It also adds a test in `search_legacy.js` to make sure that the search
text is placed as intended.

Fixes: #14771.
2020-06-11 15:49:12 -07:00
Ryan Rehman cfc87e3925 message list: Move the `FetchStatus` object to MessageListData class.
The reason for this change is that, this is where `Filter` and
actual tracking of what messages are contiguous lives. This
will be beneficial when we will to move to a model where we
cache `MessageListData` objects for a large number of views.
2020-06-02 15:45:39 -07:00
Tim Abbott 1058c08623 narrow: Fix a typo in the then_select_id comment. 2020-05-21 12:41:55 -07:00
Tim Abbott b746e0220b narrow: Add a block comment for narrow.activate. 2020-05-19 10:47:52 -07:00
Aman Agrawal cfe427b3f7 narrow: bugfix: Update stream list height after rendering completes.
When switching from Private Messages narrow to
All messages narrow, stream list max-height was not
correctly updated. Stream list max-height was calculated
 before new height were updated by browser for
All message narrow.

Inshort:
Stream list max-height was being updated before the browser could
render height for `#global_filters`. Calling resize after narrow
completes removes this issue.
2020-04-28 12:32:40 -07:00
YashRE42 bad60ca7be navbar: Append space at the end of filter for search convenience.
As long as the current narrow isn't already a search narrow or empty,
we add a single space at the end of the current filter so that the
user can just press the right arrow key and begin typing their search
term, instead of having to add a space themselves.
2020-04-22 15:11:30 -07:00
Hashir Sarwar ee0d4541b4 topic_data: Rename `topic_data` module to `stream_topic_history`.
`stream_topic_history` is a more appropriate name as this
module will contain information about last message of a
stream in upcoming commits. Function and variable names
are changed accordingly like:

* topic_history() -> per_stream_history()
* get_recent_names() -> get_recent_topic_names()
* name -> topic_name
2020-04-16 20:11:04 -07:00
Tim Abbott 655993bf0f narrow: Don't advertise streams:public in is:starred.
We fix this by adding a more expressive data function, with tests, for
whether a filter is on UserMessage data, which would mean that
streams:public could never add additional matches.
2020-04-08 11:25:18 -07:00
Stefan Weil d2fa058cc1
text: Fix some typos (most of them found and fixed by codespell).
Signed-off-by: Stefan Weil <sw@weilnetz.de>
2020-03-27 17:25:56 -07:00
Steve Howell 778d457bf7 Avoid blueslip error for empty streams.
We simplify the code for deciding whether
we show a subscribe button or not, and in
doing so avoid a blueslip error where we
were passing `undefined` into `get_sub()`.
2020-03-22 11:29:02 -07:00
Steve Howell 327831df1e hotkeys: Fix "n" key behavior in some narrows.
If you were in the "Starred messages" narrow and
your pointer was on a message with the stream/topic
of "social/lunch", we wouldn't move you to the unread
messages for that topic.

I fixed this by removing the code that looked at
the current message's topic.  Instead, we only look
at the active narrow to figure out the "next" topic
to go to.

Fixes #14120.
2020-03-17 05:41:47 -07:00
Anders Kaseorg fe082248cc js: Convert _.defaults to spread syntax.
This is not always a behavior-preserving translation: _.defaults
mutates its first argument.  However, the code does not always appear
to have been written to expect that.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
2020-02-25 14:09:39 -08:00
shubhamgupta2956 efda2684ea util: Replace util.get_message_topic().
Replace `util.get_message_topic(message)` with `message.topic`.

Fixes #13931
2020-02-21 09:53:45 -05:00
Steve Howell 9ab07d1038 util.js: Remove util from window.
We now treat util like a leaf module and
use "require" to import it everywhere it's used.

An earlier version of this commit moved
util into our "shared" library, but we
decided to wait on that.  Once we're ready
to do that, we should only need to do a
simple search/replace on various
require/zrequire statements plus a small
tweak to one of the custom linter checks.

It turns out we don't really need util.js
for our most immediate code-sharing goal,
which is to reuse our markdown code on
mobile.  There's a little bit of cleanup
still remaining to break the dependency,
but it's minor.

The util module still calls the global
blueslip module in one place, but that
code is about to be removed in the next
few commits.

I am pretty confident that once we start
sharing things like the typeahead code
more aggressively, we'll start having
dependencies on util.  The module is barely
more than 300 lines long, so we'll probably
just move the whole thing into shared
rather than break it apart.  Also, we
can continue to nibble away at the
cruftier parts of the module.
2020-02-15 12:20:20 -08:00
Anders Kaseorg 2285ee922e js: Convert _.contains(a, …) to a.includes(…).
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
2020-02-10 14:08:12 -08:00
Anders Kaseorg ef50346a29 js: Convert _.reject(a, … => …) to a.filter(… => !…).
And convert the corresponding function expressions to arrow style
while we’re here.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
2020-02-10 14:08:12 -08:00
Anders Kaseorg ac7b09d57e js: Convert _.map(a, …) to a.map(…).
And convert the corresponding function expressions to arrow style
while we’re here.

import * as babelParser from "recast/parsers/babel";
import * as recast from "recast";
import * as tsParser from "recast/parsers/typescript";
import { builders as b, namedTypes as n } from "ast-types";
import K from "ast-types/gen/kinds";
import fs from "fs";
import path from "path";
import process from "process";

const checkExpression = (node: n.Node): node is K.ExpressionKind =>
  n.Expression.check(node);

for (const file of process.argv.slice(2)) {
  console.log("Parsing", file);
  const ast = recast.parse(fs.readFileSync(file, { encoding: "utf8" }), {
    parser: path.extname(file) === ".ts" ? tsParser : babelParser,
  });
  let changed = false;

  recast.visit(ast, {
    visitCallExpression(path) {
      const { callee, arguments: args } = path.node;
      if (
        n.MemberExpression.check(callee) &&
        !callee.computed &&
        n.Identifier.check(callee.object) &&
        callee.object.name === "_" &&
        n.Identifier.check(callee.property) &&
        callee.property.name === "map" &&
        args.length === 2 &&
        checkExpression(args[0]) &&
        checkExpression(args[1])
      ) {
        const [arr, fn] = args;
        path.replace(
          b.callExpression(b.memberExpression(arr, b.identifier("map")), [
            n.FunctionExpression.check(fn) ||
            n.ArrowFunctionExpression.check(fn)
              ? b.arrowFunctionExpression(
                  fn.params,
                  n.BlockStatement.check(fn.body) &&
                    fn.body.body.length === 1 &&
                    n.ReturnStatement.check(fn.body.body[0])
                    ? fn.body.body[0].argument || b.identifier("undefined")
                    : fn.body
                )
              : fn,
          ])
        );
        changed = true;
      }
      this.traverse(path);
    },
  });

  if (changed) {
    console.log("Writing", file);
    fs.writeFileSync(file, recast.print(ast).code, { encoding: "utf8" });
  }
}

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
2020-02-10 14:08:12 -08:00
Anders Kaseorg 719546641f js: Convert a.indexOf(…) !== -1 to a.includes(…).
Babel polyfills this for us for Internet Explorer.

import * as babelParser from "recast/parsers/babel";
import * as recast from "recast";
import * as tsParser from "recast/parsers/typescript";
import { builders as b, namedTypes as n } from "ast-types";
import K from "ast-types/gen/kinds";
import fs from "fs";
import path from "path";
import process from "process";

const checkExpression = (node: n.Node): node is K.ExpressionKind =>
  n.Expression.check(node);

for (const file of process.argv.slice(2)) {
  console.log("Parsing", file);
  const ast = recast.parse(fs.readFileSync(file, { encoding: "utf8" }), {
    parser: path.extname(file) === ".ts" ? tsParser : babelParser,
  });
  let changed = false;

  recast.visit(ast, {
    visitBinaryExpression(path) {
      const { operator, left, right } = path.node;
      if (
        n.CallExpression.check(left) &&
        n.MemberExpression.check(left.callee) &&
        !left.callee.computed &&
        n.Identifier.check(left.callee.property) &&
        left.callee.property.name === "indexOf" &&
        left.arguments.length === 1 &&
        checkExpression(left.arguments[0]) &&
        ((["===", "!==", "==", "!=", ">", "<="].includes(operator) &&
          n.UnaryExpression.check(right) &&
          right.operator == "-" &&
          n.Literal.check(right.argument) &&
          right.argument.value === 1) ||
          ([">=", "<"].includes(operator) &&
            n.Literal.check(right) &&
            right.value === 0))
      ) {
        const test = b.callExpression(
          b.memberExpression(left.callee.object, b.identifier("includes")),
          [left.arguments[0]]
        );
        path.replace(
          ["!==", "!=", ">", ">="].includes(operator)
            ? test
            : b.unaryExpression("!", test)
        );
        changed = true;
      }
      this.traverse(path);
    },
  });

  if (changed) {
    console.log("Writing", file);
    fs.writeFileSync(file, recast.print(ast).code, { encoding: "utf8" });
  }
}

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
2020-02-10 14:08:12 -08:00
Anders Kaseorg 02511bff1c js: Automatically convert _.each to for…of.
This commit was automatically generated by the following script,
followed by lint --fix and a few small manual lint-related cleanups.

import * as babelParser from "recast/parsers/babel";
import * as recast from "recast";
import * as tsParser from "recast/parsers/typescript";
import { builders as b, namedTypes as n } from "ast-types";
import { Context } from "ast-types/lib/path-visitor";
import K from "ast-types/gen/kinds";
import { NodePath } from "ast-types/lib/node-path";
import assert from "assert";
import fs from "fs";
import path from "path";
import process from "process";

const checkExpression = (node: n.Node): node is K.ExpressionKind =>
  n.Expression.check(node);
const checkStatement = (node: n.Node): node is K.StatementKind =>
  n.Statement.check(node);

for (const file of process.argv.slice(2)) {
  console.log("Parsing", file);
  const ast = recast.parse(fs.readFileSync(file, { encoding: "utf8" }), {
    parser: path.extname(file) === ".ts" ? tsParser : babelParser,
  });
  let changed = false;
  let inLoop = false;
  let replaceReturn = false;

  const visitLoop = (...args: string[]) =>
    function(this: Context, path: NodePath) {
      for (const arg of args) {
        this.visit(path.get(arg));
      }
      const old = { inLoop };
      inLoop = true;
      this.visit(path.get("body"));
      inLoop = old.inLoop;
      return false;
    };

  recast.visit(ast, {
    visitDoWhileStatement: visitLoop("test"),

    visitExpressionStatement(path) {
      const { expression, comments } = path.node;
      let valueOnly;
      if (
        n.CallExpression.check(expression) &&
        n.MemberExpression.check(expression.callee) &&
        !expression.callee.computed &&
        n.Identifier.check(expression.callee.object) &&
        expression.callee.object.name === "_" &&
        n.Identifier.check(expression.callee.property) &&
        ["each", "forEach"].includes(expression.callee.property.name) &&
        [2, 3].includes(expression.arguments.length) &&
        checkExpression(expression.arguments[0]) &&
        (n.FunctionExpression.check(expression.arguments[1]) ||
          n.ArrowFunctionExpression.check(expression.arguments[1])) &&
        [1, 2].includes(expression.arguments[1].params.length) &&
        n.Identifier.check(expression.arguments[1].params[0]) &&
        ((valueOnly = expression.arguments[1].params[1] === undefined) ||
          n.Identifier.check(expression.arguments[1].params[1])) &&
        (expression.arguments[2] === undefined ||
          n.ThisExpression.check(expression.arguments[2]))
      ) {
        const old = { inLoop, replaceReturn };
        inLoop = false;
        replaceReturn = true;
        this.visit(
          path
            .get("expression")
            .get("arguments")
            .get(1)
            .get("body")
        );
        inLoop = old.inLoop;
        replaceReturn = old.replaceReturn;

        const [right, { body, params }] = expression.arguments;
        const loop = b.forOfStatement(
          b.variableDeclaration("let", [
            b.variableDeclarator(
              valueOnly ? params[0] : b.arrayPattern([params[1], params[0]])
            ),
          ]),
          valueOnly
            ? right
            : b.callExpression(
                b.memberExpression(right, b.identifier("entries")),
                []
              ),
          checkStatement(body) ? body : b.expressionStatement(body)
        );
        loop.comments = comments;
        path.replace(loop);
        changed = true;
      }
      this.traverse(path);
    },

    visitForStatement: visitLoop("init", "test", "update"),

    visitForInStatement: visitLoop("left", "right"),

    visitForOfStatement: visitLoop("left", "right"),

    visitFunction(path) {
      this.visit(path.get("params"));
      const old = { replaceReturn };
      replaceReturn = false;
      this.visit(path.get("body"));
      replaceReturn = old.replaceReturn;
      return false;
    },

    visitReturnStatement(path) {
      if (replaceReturn) {
        assert(!inLoop); // could use labeled continue if this ever fires
        const { argument, comments } = path.node;
        if (argument === null) {
          const s = b.continueStatement();
          s.comments = comments;
          path.replace(s);
        } else {
          const s = b.expressionStatement(argument);
          s.comments = comments;
          path.replace(s, b.continueStatement());
        }
        return false;
      }
      this.traverse(path);
    },

    visitWhileStatement: visitLoop("test"),
  });

  if (changed) {
    console.log("Writing", file);
    fs.writeFileSync(file, recast.print(ast).code, { encoding: "utf8" });
  }
}

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
2020-02-07 14:09:47 -08:00
Tim Abbott 7479a9b448 narrow: Use "newest" anchor rather than a huge ID when narrowing.
This causes the Zulip frontend to take advantage of the new
server-side support for passing a string-format anchor that's clear
about what it means.
2020-01-29 12:17:21 -08:00
Tim Abbott b25fea24e7 messages: Simplify API for use_first_unread_anchor.
Now that we have the type situation of having anchor support passing a
string, this is a much more natural way to implement
use_first_unread_anchor.

We still support the old interface to avoid breaking compatibility
with legacy versions of the mobile apps.
2020-01-29 12:17:03 -08:00
Tim Abbott bf2f36e6b4 message_fetch: Fix load_messages_for_narrow anchor parameter.
This makes the code more readable, by just passing the anchor through
without changing its field name back and forth.

There's no reason for this parameter to involve parsing and integer --
it should be a number in all incoming code paths.
2020-01-29 11:24:58 -08:00
Tim Abbott 3a41cb6c28 narrow: Clarify streams:public user experience.
This tightens the text and adds a direct link to the modified search.
2019-12-10 18:36:51 -08:00
Tim Abbott eb65eb52dc narrow: Extract update_narrow_title.
This just makes the flow of narrow.activate easier to follow.
2019-12-10 18:13:30 -08:00
Tim Abbott e72da08f09 narrow: Fix streams:all notice appearing too early.
The streams:all adveritsement notice in search should only appear
after we've already received the response from the server, to avoid a
mix of problems ranging from misplaced loading indicator to scrolling
issues to the notice just being distracting while you're waiting for
the server to return results.

We need to add a pre_scroll_cont parameter to the message_fetch API,
since adding this notice would otherwise potentially throw off the
scroll positioning logic for which message to select.

Fixes #13441.
2019-12-10 18:10:39 -08:00