This PR styles the notifications for the notification panel.

These are the notification toasts you receive when you have a new
notification (e.g., a mention in chat):

<img width="423" alt="Screenshot 2024-01-19 at 11 39 16 AM"
src="https://github.com/zed-industries/zed/assets/1486634/a1fc7a67-5aad-4cb2-8dc9-35d302984fcb">

Release Notes:

- Improved the look of toasts for incoming notifications.

This PR updates the tenses used by the summary line of doc comments to
match the [Rust API documentation
conventions](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#summary-sentence).

Specifically:

> The summary line should be written in third person singular present
indicative form. Basically, this means write ‘Returns’ instead of
‘Return’.

I'm sure there are plenty occurrences that I missed.

Release Notes:

- N/A

This PR fixes the assistant panel header when in the conversation
history view to hide the irrelevant tools and/or the slots where they
would go.

Release Notes:

- Improved the assistant panel header when viewing conversation history.

Before this change, we would send requests to language servers without
canceling them even if we never wait for their response.

Example: when doing document highlights, we'd send a request (modulo
debouncing) whenever a change was made, ignoring previously sent
requests that might still be in-flight.

With this change, we now send a Cancel request (from the LSP spec) to
the language server in case no one listens to the response anymore
(which is what happens when the `Future` returned by `request_internal`)
is dropped.

Release Notes:

- Improved performance when interacting with language servers.

Before this change, we would send requests to language servers without
canceling them even if we never wait for their response.

Example: when doing document highlights, we'd send a request (modulo
debouncing) whenever a change was made, ignoring previously sent
requests that might still be in-flight.

With this change, we now send a Cancel request (from the LSP spec) to
the language server in case no one listens to the response anymore
(which is what happens when the `Future` returned by `request_internal`)
is dropped.

Who uses VS Code anymore?

Release Notes:

- N/A

The layout of the chat panel wasn't correct but this visual glitch was
being masked by caching, because it seems like Taffy was rendering
things slightly differently when laying out the chat panel as a detached
layout node. This wasn't an issue with caching, but rather an
inconsistency with how Taffy lays things out.

Release Notes:

- N/A

The layout of the chat panel wasn't correct but this visual glitch
was being masked by caching, because it seems like Taffy was rendering
things slightly differently when laying out the chat panel as a detached
layout node. This wasn't an issue with caching, but rather an inconsistency
with how Taffy lays things out.

Co-Authored-By: Thorsten <thorsten@zed.dev>
Co-Authored-By: Piotr <piotr@zed.dev>

Refs https://github.com/zed-industries/zed/pull/4131
Refs https://github.com/zed-industries/community/issues/2415

Previously, when a view cache miss occurred during paint, we would
either use the element produced during layout or create a new, detached
node layout node. In both cases, we would issue a call to `draw`.

The problem with this approach, however, is that `draw` would always
paint the element at the given `bounds.origin`, which was required when
the layout node was detached but harmful when the element was already
embedded in the layout tree and already knew its bounds. In this second
case, in fact, it was as if we were positioning the element "twice",
which caused content to jump.

Release Notes:

- N/A

Deals with `Can't rename channels from keyboard` #product note.
We actually already have the action binding to rename the context menu
entries, but had no label entry to show that.

Release Notes:

- Added a channel rename keymap label on the collab panel context menu

This PR removes some more commented-out code from various spots in the
codebase.

Release Notes:

- N/A

This PR removes some commented-out code in the `auto_update` crate that
we no longer need.

Release Notes:

- N/A

This PR enables cursors for remote participants.

They are shown for 2 seconds when you focus a buffer, and then on hover.

Release Notes:

- Added usernames next to remote cursors

It seems that sometimes calling toggleFullScreen will cause the
display_layer callback of a different window to fire.

This PR fixes some more references in the docs in the `ui` crate.

Release Notes:

- N/A

This PR renames the `overflow_hidden_x` and `overflow_hidden_y` methods
to `overflow_x_hidden` and `overflow_y_hidden`, respectively.

This provides consistency with our `overflow_x_scroll` /
`overflow_y_scroll` methods, as well as better matches Tailwind's
naming.

Release Notes:

- N/A

This PR makes it so long diagnostic messages no longer overflow the
status bar and push the right tools off-screen.

Here is an example with a long (placeholder) diagnostic message:

<img width="1136" alt="Screenshot 2024-01-18 at 9 47 07 PM"
src="https://github.com/zed-industries/zed/assets/1486634/18568527-c608-4d4a-9118-b84c6d81c13e">

Release Notes:

- Fixed long diagnostic messages overflowing the status bar.

This reverts commit 345b983c8edd18acc346845dcdd1266e144a05a9.

This seems to have caused only the first line of panics to be reported
in production builds.

Release Notes:

- (Added|Fixed|Improved) ...
([#<public_issue_number_if_exists>](https://github.com/zed-industries/community/issues/<public_issue_number_if_exists>)).

This reverts commit 345b983c8edd18acc346845dcdd1266e144a05a9.

This PR turns `FacePile` back into a component.

Our usage of it seemed a little weird, with us calling `render`
manually.

We're now implementing `Styled` on `FacePile` through its inner `Div` so
that we can apply the `p_1` at the call site.

Release Notes:

- N/A

Also, factors out the fluent building APIs from IntoElement into their
own traits.

Also makes the project panel context menu initialization fluent:

<img width="1328" alt="Screenshot 2024-01-18 at 3 33 45 PM"
src="https://github.com/zed-industries/zed/assets/2280405/3468b6f2-07f0-48cf-bec1-ac0379333209">

Release Notes:

- Fixed pop in when right clicking on the project panel.

This PR tweaks the description of the `gpui` crate, since it's now the
only version.

There can only be one!

Release Notes:

- N/A

This PR makes clicking the label inside of a `ListHeader` with a
disclosure also toggle the disclosure.

Release Notes:

- Added support for clicking the "Online", "Offline", and "Requests"
headers in the contact list to toggle their expansion.

This PR removes the VS Code themes from the `assets/` directory, as
we're not currently using them (and it's unlikely we will in their
current state).

Release Notes:

- N/A

I'm not yet sure whether this is 100% correct, but it seems to alleviate
the following issue:
`When opening a dock, the panel doesn't appear right away. An empty dock
is briefly visible.`
Release Notes:

- Fixed panel layout being incorrect for a brief time after opening
(fixes https://github.com/zed-industries/community/issues/2415)

This PR adds a Git [`.mailmap`](https://git-scm.com/docs/gitmailmap)
file to canonicalize committer names/emails.

Release Notes:

- N/A

This uploads apples crash reports to our servers when telemetry is
enabled.

Rather than jumping via the website, it uploads to collab directly. (I'd
like
to update the panic handler to do this too to make it possible to work
on that end-to-end without zed.dev running).

Release Notes:

- Added reporting of crashes when telemetry is enabled

This PR styles the reset key state for the assistant panel.

Community issue: https://github.com/zed-industries/community/issues/2429

<img width="641" alt="Screenshot 2024-01-18 at 4 28 32 PM"
src="https://github.com/zed-industries/zed/assets/1486634/57377804-2867-45d3-906c-353130ec78e6">

Release Notes:

- Fixed the reset key screen for the assistant panel.

Reserves 4 characters for the line number in the gutter to avoid editor bounds jumping when editing small files like commit messages.