Reverts zed-industries/zed#4236

This causes an infinite loop when opening the language server logs

This PR updates the docs to make it clearer that macOS Sonoma is
supported.

Release Notes:

- N/A

Since our last measurements, startup time in Zed had regressed quite
significantly. This was due to several issues:

- We were loading IBMPlex, which we're not really using in the UI.
- Images were being parsed in the foreground, thus blocking the main
thread
- Language models (for semantic index and assistant) were being loaded
in the foreground, thus blocking the main thread
- Interaction with the keychain was blocking the main thread

In addition to these, with this pull request we will now deserialize the
items for a pane in parallel, as opposed to doing so sequentially.

All combined, when running the zed binary directly this brings startup
time from ~350ms to ~210ms on my machine.

Release Notes:

- Improved startup time.

This fixes https://github.com/zed-industries/community/issues/2442 for
me.

Previously, the tab bar buttons would stay when the chat panel was
opened (and received focus) until something else was drawn (or caused a
render?)

With this change, the tab bar buttons are only shown if the pane was
focus.

I'm not sure about the side-effects of this, but the toolbar still seems
to work fine.

### Before


https://github.com/zed-industries/zed/assets/1185253/24b56e51-467b-4a09-909f-72ee6f76f32c

### After



https://github.com/zed-industries/zed/assets/1185253/18865f49-d00e-453a-8a38-aee15f06beb8



### Release Notes:

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

[[PR Description]]

Release Notes:

- N/A

This time around, we address the flicker seen in #3857 by querying the active item (that might've just been added),
as it knows whether it has focus even if the parent Pane does not.

Co-authored-by: Thorsten <thorsten@zed.dev>

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

We recently doubled the size of the `ELEMENT_ARENA` after someone ran
into a panic due to the arena running out of space.

This adds some logging so that we can hopefully develop a better
understanding of when the element area's allocation is elevated.

Release Notes:

- N/A

This fixes https://github.com/zed-industries/community/issues/2442 for
me.

Previously, the tab bar buttons would stay when the chat panel was
opened (and received focus) until something else was drawn (or caused a
render?)

With this change, the tab bar buttons are only shown if the pane was
focus.

I'm not sure about the side-effects of this, but the toolbar still seems
to work fine.

This fixes the performance problem we saw in
https://github.com/zed-industries/community/issues/2405.

In a trace we could see that if a font is missing we'd constantly look
it up and never cache that it's missing.

This changes that and does cache the font-is-missing result.

Drawback is that one would need to restart Zed after installing a
missing font that was configured in settings. That seems acceptable for
now, though.

Release Notes:

- Improved rendering performance when configured fonts are missing on
the system.

We recently doubled the size of the `ELEMENT_ARENA` after someone ran
into a panic due to the arena running out of space.

This adds some logging so that we can hopefully develop a better
understanding of when the element area's allocation is elevated.

Co-authored-by: Antonio <antonio@zed.dev>

This fixes the performance problem we saw in https://github.com/zed-industries/community/issues/2405.

In a trace we could see that if a font is missing we'd constantly look
it up and never cache that it's missing.

This changes that and does cache the font-is-missing result.

Drawback is that one would need to restart Zed after installing a
missing font that was configured in settings. That seems acceptable for
now, though.

Co-authored-by: Antonio <antonio@zed.dev>

This fixes a panic we just saw on nightly. It's the first time we see
this panic, so I think it's pretty safe to assume having twice as much
capacity will fix it.

Release Notes:

- Fixed a crash that could sometimes occur when the window contained
lots of graphical elements.

This fixes a panic we just saw on nightly. It's the first time we
see this panic, so I think it's pretty safe to assume having twice as
much capacity will fix it.

I want to immediately archive the `keymaps` repo tomorrow. This is the
only change that needs to be brought over.

Release Notes:

- N/A

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