This PR does some cleanup of the `gpui` docs, making sure we're linking
things appropriately and following good Rust documentation style.

Release Notes:

- N/A

This PR fixes a bug in GPUI where the observation API would not be
triggered if a focus event caused a `notify()`

Release Notes:

- N/A

This PR adds a `CODE_OF_CONDUCT.md` that links out to the existing code
of conduct on the Zed site.

The link in the file is currently a dead link, but will work once the
new site goes live tomorrow.

Release Notes:

- N/A

This PR balances the headings in the README.

Release Notes:

- N/A

This PR updates the README by removing the TODO items and linking out to
the contributing docs.

Release Notes:

- N/A

* Fixed jumping of list item when the separator appeared and
disappeared.
* Fixed a bug where the selection got into a valid state when updating
the matches

Release Notes:

- Fixed an issue where the file finder's selection got into a state
where nothing was selected after filtering the matches.

This PR adds a barebones README to the `gpui` crate, just so folks have
somewhere to land on when we link them here from
[gpui.rs](https://www.gpui.rs/).

We can flesh this out as we go.

Release Notes:

- N/A

- Distinct colors to make it not confusing
- Avoid overflowing the edge of the editor when the message is long


Release Notes:

- Improved display of diagnostic blocks (F8)

Previously, while typing, the separator appearing and disappeaering would
cause the layout of the items below to jump up and down.

Previously, the size of the file finder file would cause code formatting to time out.

Reverts zed-industries/zed#4226

Unfortunately there where some worse states possible after this PR.
Reverting until after the launch, as the problems it addresses are still
bad.

![Screenshot 2024-01-23 at 3 20
59 PM](https://github.com/zed-industries/zed/assets/2280405/d25ab0d5-db49-44cb-b865-e320a97616ce)

- Distinct colors to make it not confusing
- Avoid overflowing the edge of the editor when the message is long

- [x] Fill in GPL license text.
- [x] live_kit_client depends on live_kit_server as non-dev dependency,
even though it seems to only be used for tests. Is that an issue?

Release Notes:
- N/A

Reverts
https://github.com/zed-industries/zed/pull/3748/commits/2f56fe9129e98520ee9ffbc79c38f0d01ae4ca4d
since gitignored file indexing is inconsistent.

Release Notes:

- Removed the ability to search in gitignored files via file_finder for
now, as it's not consistent enough for good UX

This is a bit redundant, as cargo test does not reuse results of cargo
check, so we're essentially doing the cargo check unnecessarily.

Release Notes:

- N/A

![Screenshot 2024-01-23 at 1 03
01 PM](https://github.com/zed-industries/zed/assets/326587/28b4e7e1-8847-40ff-aed6-0f4ede6b9007)


Release Notes:

- Fixed an issue where ignored files were not visually distinguished in
the project panel.

Before:

* cutoff completion labels and docs
<img width="801" alt="image"
src="https://github.com/zed-industries/zed/assets/2690773/12fe39b2-a8a7-42d8-b697-e2a4fbd836b7">

* too long action labels start to introduce newlines and break the
layout
<img width="716" alt="image"
src="https://github.com/zed-industries/zed/assets/2690773/a0530f1e-4200-4cc4-8e0f-9a63d04e4d5c">

* too long completion proposals are cut off
<img width="1321" alt="image"
src="https://github.com/zed-industries/zed/assets/2690773/1ec154a1-9de5-4e47-9e9f-632b3e33f42a">



After:

* the docs are shifted, but both completions and docs are rendered
entirely now
<img width="1351" alt="image"
src="https://github.com/zed-industries/zed/assets/2690773/ddb0baa4-88b6-45e9-b3e1-496c0d6a0d0f">

* 
<img width="750" alt="image"
src="https://github.com/zed-industries/zed/assets/2690773/102ed77c-d7d0-41d2-a4a0-a8c73285ea8a">

* completions are not jumping in sized anymore, with all elements
aligned to occupy max elements' width and height
<img width="1459" alt="image"
src="https://github.com/zed-industries/zed/assets/2690773/483e3534-b00a-423c-a848-3c4ca1199510">


Release Notes:

- Improved completion and action label layouts

This PR removes an unused screenshot from the `assets/` directory.

As a note, we should probably be careful about what kinds of extraneous
binary assets we're committing to the repo (especially ones not required
for Zed itself), as these can bloat the repo size.

Release Notes:

- N/A

* make completion elements as wide as the longest element
* make completion docs scrollable

co-authored-by: Piotr <piotr@zed.dev>

Release Notes:

- N/A

Some adjustments to be less bold in our pairing commitments and clearer
about the process for proposing an idea.

Release Notes:

- N/A

We were leaking the previous active item's subscription, which meant
that we would receive the `MatchesInvalidated` event as many times as we
changed items.

Release Notes:

- Fixed a performance issue when switching the active item while the
search bar was open.

Co-Authored-By: Max Brunsfeld <max@zed.dev>

- Remove ZED_SECRET_CLIENT_TOKEN
- Remove ZED_CLIENT_SECRET_TOKEN

Neither of these were ever actually a secret.

Release Notes:

- N/A

We were leaking the previous active item's subscription, which meant
that we would receive the `MatchesInvalidated` event as many times as
we changed items.

Co-Authored-By: Thorsten Ball <thorsten@zed.dev>
Co-Authored-By: Mikayla Maki <mikayla@zed.dev>

This isn't my favorite idea of a fix, but it does work for now, and it
seems likely the terminal will need to configure other aspects of action
dispatch in the future.

In the future we should explore making it possible to do this via the
keymap, either by making disabling bindings more robust; or by having a
way to indicate immediate mode per binding.

Release Notes:

- Fixed a bug where cmd-k in terminal took 1s

Release Notes:

- N/A

This isn't my favorite idea of a fix, but it does work for now, and it
seems likely the terminal will need to configure other aspects of action
dispatch in the future.

In the future we should explore making it possible to do this via the
keymap, either by making disabling bindings more robust; or by having a
way to indicate immediate mode per binding.

Missed one crate.
Release Notes:

- N/A

- GPUI and all dependencies: Apache 2
- Everything else: AGPL

Here's a script that I've generated for it:
https://gist.github.com/osiewicz/6afdd6626e517da24a2092807e6f0b6e

Release Notes:
- N/A

---------

Co-authored-by: David <david@zed.dev>