This PR wires up the ability to configure Assistant2.

<img width="1309" alt="Screenshot 2025-01-22 at 1 52 56 PM"
src="https://github.com/user-attachments/assets/3de47797-7959-47af-bd93-51f105e87c28"
/>

Release Notes:

- N/A

This PR is a small refactoring that extracts the Assistant's
`ConfigurationView` into its own module.

Release Notes:

- N/A

In the future if `filter` was used more this would fix other issues. In
the current code paths, this just fixes the particular corner case of
edit prediction arriving async while `y_flipped = true` (in this case it
needs to be scrolled down to show item with index 0).

Release Notes:

- N/A

This PR is a follow-up to
https://github.com/zed-industries/zed/pull/23470 that simplifies the way
we check the `git-ui` feature flag in the title bar.

Release Notes:

- N/A

Reverts zed-industries/zed#22182
I've merged the build too soon as I wanted it to be excluded from todays
Preview.

Closes #23358

Demo/proof:


https://github.com/user-attachments/assets/2036d183-8830-415b-9155-0d3efe3d824c




Release Notes:

- Fixed `%` in Vim mode not working correctly for multi-char brackets,
such as `do/end` in Elixir or `\begin` and `\end` in LaTeX.

Co-authored-by: Conrad <conrad@zed.dev>

Fixes an issue where the repo selector showed for all users, not just
those in the git_ui feature flag.

This was meant to be included in the `git_ui` feature flag.

Release Notes:

- N/A

This PR introduces a new entity called Project Tree which is responsible
for finding subprojects within a worktree;
a subproject is a language-specific subset of a worktree which should be
accurately tracked on the language server side. We'll have an ability to
set multiple disjoint `workspaceFolder`s on language server side OR
spawn multiple instances of a single language server (which will be the
case with e.g. Python language servers, as they need to interact with
multiple disjoint virtual environments).
Project Tree assumes that projects of the same LspAdapter kind cannot
overlap. Additionally **project nesting** is not allowed within the
scope of a single LspAdapter.

Closes #5108

Release Notes:

- Language servers now track their working directory more accurately.

---------

Co-authored-by: João <joao@zed.dev>

This PR updates the Book Onboarding links to point to a new form.

Release Notes:

- N/A

#23460 brought up we are showing the new "tab Accept" marker for single
line suggestions for non-zeta providers. We think this might be valid
for any provider, but we only want to enable it for zeta initially so it
doesn't affect an existing user base.

Release Notes:

- N/A

This PR fixes an issue where Assistant2 was not respecting the panel
dock position.

Release Notes:

- N/A

Release Notes:

- N/A

#23411 introduced an "Accept" callout for single line edits, but the
logic to detect them was incorrect causing it to trigger for multiline
insertions, this PR fixes that.

Release Notes:

- N/A

Fixes #23430

Closes #23430

Release Notes:

- N/A

Closes #22653 again

In PR #23283, I thought that every `runnable` dispatched to the main
thread would correspond to an `EVENT_DISPATCHED` message in the message
queue. However, after testing, some `runnable`s occasionally weren’t
executed.

This PR updated the code as follows:  
```rust
if let Ok(runnable) = self.main_receiver.try_recv() {    <-- before
for runnable in self.main_receiver.drain() {            <-- after
    runnable.run();
}
```

This ensures that runnables are handled more proactively on the main
thread, now we handle `runnable`s with a much higher priority.

A big thanks to @MolotovCherry and @ArthurBrussee for their testing
efforts!

Release Notes:

- N/A

Considered doing this when previously working on completions menu
layout, as it brings the default selection position next to the cursor
position, and is generally more symmetrical. With #23445 there is now a
more compelling reason, as the "translucent, cropped bottom" display
doesn't make sense when displayed above.

Release Notes:

- N/A

The keymap error notifications got convoluted to support displaying the
notification on startup. This change addresses it systemically for all
future app notifications.

Reverts most of #20531, while keeping the fix to handle keyboard layout
switching. This is a better fix for #20531

Release Notes:

- N/A

This PR adjusts how the `AssistantPanelDelegate` global is set to be
based on the state of the feature flag.

This should prevent `assistant` and `assistant2` from potentially
clobbering each other.

Release Notes:

- N/A

This PR fixes an issue where the default prompt was not being inserted
into the prompt editor in Assistant2.

Release Notes:

- N/A

This PR consolidates the two Assistant panels into one for users in the
`assistant2` feature flag.

Now that the Assistant1 prompt editor is accessible through the
Assistant2 panel, we no longer have a need to show both panels.

Release Notes:

- N/A

This PR adds the prompt editor history to Assistant2.

<img width="1309" alt="Screenshot 2025-01-21 at 9 02 07 PM"
src="https://github.com/user-attachments/assets/d79936fe-1c23-425f-b99d-43f85afd0c39"
/>

Release Notes:

- N/A

This PR extracts the `ContextHistory` to the `assistant_context_editor`
crate.

Release Notes:

- N/A

This PR adds the Assistant1 experience to Assistant2 as a "prompt
editor".

<img width="1309" alt="Screenshot 2025-01-21 at 7 17 26 PM"
src="https://github.com/user-attachments/assets/3ce2f32b-2b1a-48a8-8e56-4c44e3ac4ce5"
/>

Release Notes:

- N/A

Add `editor:: SwapSelectionEnds ` action which swaps the cursor location from the beginning/end of a given selection.
Renamed from `editor::ExchangeMark` to `editor::SwapSelectionEnds`.
Unbound by default, bound to `ctrl-x ctrl-x` in Emacs keymap.

This PR adds a rough-and-ready picker for selecting which of the
project's repositories the git panel should display.

Release Notes:

- N/A

---------

Co-authored-by: Nate Butler <iamnbutler@gmail.com>
Co-authored-by: Nate <nate@zed.dev>

This PR extracts the `ContextEditor` to the `assistant_context_editor`
crate.

As part of this, we have decoupled the `ContextEditor` from the
`AssistantPanel`.

There is now an `AssistantPanelDelegate` that the `ContextEditor` uses
when it needs to interface with the Assistant panel.

Release Notes:

- N/A

This PR adds a new `assistant_context_editor` crate.

This will ultimately house the `ContextEditor` so that it can be
consumed by both `assistant` and `assistant2`.

For the purposes of this PR, we just introduce the crate and move some
supporting constructs to it, such as the `ContextStore`.

Release Notes:

- N/A

- Closes: https://github.com/zed-industries/zed/issues/22521
- Follow-up to: https://github.com/zed-industries/zed/pull/22376

Problem: If you click on "Tinted Icons", "Icon Color" is also activated.

Release Notes:

- N/A

This PR removes the `paths-ignore` for docs again, as it causes
docs-only PRs to be unmergable in combination with required status
checks (which we need in order to support merge-when-ready).

We can put these back if and only if we come up with a solution for how
to make it work with required status checks.

Release Notes:

- N/A

This PR extracts the `ContextEditor` and `ContextHistory`
implementations into their own modules so that it's clearer which parts
depend on other constructs in the `assistant` crate.

Release Notes:

- N/A

Release Notes:

- N/A

Co-authored-by: Richard <richard@zed.dev>

https://github.com/user-attachments/assets/655f20a9-f22f-4f91-870e-d40b20c8c994

Release Notes:

- N/A

Co-authored-by: Danilo <danilo@zed.dev>

This PR changes the `GitPanel` and `GitState` to use a
`language::Buffer` for the commit message. This is a small initial step
toward remote editing and collaboration support.

Release Notes:

- N/A

---------

Co-authored-by: Max <max@zed.dev>

* Remove `NotificationHandle` trait in favor of just passing `AnyView` -
id field wasn't used.

* Remove `show_notification_once`, doesn't seem to be needed for its
only use.

Release Notes:

- N/A

## Problem

When developing extensions locally, developers will commonly put their
source code in a specific directory. Zed uses this directory to create a
symlink starting from `$HOME/Library/Application
Support/Zed/extensions/installed` (MacOS path). When a developer then
moves this source code and tries to reinstall the extension, Zed will
fail with an unhelpful message (you can check the #Testing section).

## Change Summary

With this PR, we fix this behaviour by handling broken symlinks
specifically when returning the metadata on `fs::metadata`. Today, we

1. Pull the symlink metadata.
2. Return it if the file was not a symlink OR if it is, pull the
metadata for the pointed file.

After this change gets merged, we return the Symlink metadata if the
symlink is broken. This makes the symlink be recreated since we remove
the symlink either way.

## Risks associated with this change

It's possible changing this behaviour will show additional cases where
we are handling broken symlinks incorrectly. I expect this to be a
better scenario AND backwards compatible. We have the same behaviour we
had for 1. existing symlinks 2. normal files.

## Testing

The way I have been reproducing this is by having a private extension of
my own. I install it using the `zed: install dev extension` command
after running `RUST_LOG=debug RUST_BACKTRACE=1 scripts/zed-local -1`.
Then I move the extension to a different directory.

Zed will now keeps a broken link on its `installed` directory:

```
❯ ll
Permissions Size User    Date Modified Name
lrwxr-xr-x@    - enrikes 24 Dec 12:15  brazil-config-zed-extension -> /Volumes/workplace/BrazilConfigZedExtension
drwxr-xr-x@    - enrikes  5 Dec 14:48  java
drwxr-xr-x@    - enrikes 12 Dec 13:04  kotlin
drwxr-xr-x@    - enrikes 25 Oct 08:13  rose-pine-theme
```

Before the patch, Zed shows on its logs:

```
2024-12-24T16:44:02+01:00 INFO  extension::extension_builder] compiled Rust extension /Users/enrikes/Documents/BrazilConfigZedExtension
[2024-12-24T16:44:02+01:00 INFO  extension::extension_builder] compiling grammar brazil_config for extension /Users/enrikes/Documents/BrazilConfigZedExtension
[2024-12-24T16:44:02+01:00 INFO  extension::extension_builder] checking out brazil_config parser
[2024-12-24T16:44:04+01:00 INFO  extension::extension_builder] compiling brazil_config parser
[2024-12-24T16:44:05+01:00 INFO  extension::extension_builder] compiled grammar brazil_config for extension /Users/enrikes/Documents/BrazilConfigZedExtension
[2024-12-24T16:44:05+01:00 INFO  extension::extension_builder] finished compiling extension /Users/enrikes/Documents/BrazilConfigZedExtension
[2024-12-24T16:44:05+01:00 ERROR extensions_ui] No such file or directory (os error 2)

Stack backtrace:
   0: std::backtrace_rs::backtrace::libunwind::trace
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1: std::backtrace_rs::backtrace::trace_unsynchronized
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2: std::backtrace::Backtrace::create
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/backtrace.rs:331:13
   3: anyhow::error::<impl core::convert::From<E> for anyhow::Error>::from
             at /Users/enrikes/.cargo/registry/src/index.crates.io-6f17d22bba15001f/anyhow-1.0.94/src/backtrace.rs:27:14
   4: <core::result::Result<T,F> as core::ops::try_trait::FromResidual<core::result::Result<core::convert::Infallible,E>>>::from_residual
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/result.rs:1989:27
   5: <fs::RealFs as fs::Fs>::metadata::{{closure}}
             at ./crates/fs/src/fs.rs:603:13
```

After the patch, the extension is installed and the symlink replaced for
a new one pointing to the user's directory choice.

```
2024-12-24T16:53:33.916022+01:00 [INFO] compiled Rust extension /Users/enrikes/Documents/BrazilConfigZedExtension
2024-12-24T16:53:33.916094+01:00 [INFO] compiling grammar brazil_config for extension /Users/enrikes/Documents/BrazilConfigZedExtension
2024-12-24T16:53:33.916225+01:00 [INFO] checking out brazil_config parser
2024-12-24T16:53:35.481602+01:00 [INFO] compiling brazil_config parser
2024-12-24T16:53:35.964189+01:00 [INFO] compiled grammar brazil_config for extension /Users/enrikes/Documents/BrazilConfigZedExtension
2024-12-24T16:53:35.964319+01:00 [INFO] finished compiling extension /Users/enrikes/Documents/BrazilConfigZedExtension
2024-12-24T16:53:36.213608+01:00 [INFO] rebuilt extension index in 39.108542ms
2024-12-24T16:53:36.213835+01:00 [INFO] extensions updated. loading 0, reloading 1, unloading 0
2024-12-24T16:53:36.375928+01:00 [INFO] rebuilt extension index in 34.478167ms
2024-12-24T16:53:36.376054+01:00 [INFO] extensions updated. loading 0, reloading 1, unloading 0
```

and

```
❯ ll
lrwxr-xr-x@    - enrikes 24 Dec 16:53  brazil-config-zed-extension -> /Users/enrikes/Documents/BrazilConfigZedExtension
drwxr-xr-x@    - enrikes  5 Dec 14:48  java
drwxr-xr-x@    - enrikes 12 Dec 13:04  kotlin
drwxr-xr-x@    - enrikes 25 Oct 08:13  rose-pine-theme
```


Release Notes:

- Fix broken symlinks when installing dev extensions

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>

Reworks https://github.com/zed-industries/zed/pull/23030 and
https://github.com/zed-industries/zed/pull/15087
Closes https://github.com/zed-industries/zed/issues/23352
Closes https://github.com/zed-industries/zed/issues/23310 

Zed's completion items use `label` from LSP completion items as a base
to show in the list:
https://github.com/zed-industries/zed/blob/d290da7dac922fdc67c4774cdd371fba23fe62e3/crates/project/src/lsp_store.rs#L4371-L4374

Besides that, certain language plugins append `detail` or
`label_details.description` as a suffix:
https://github.com/zed-industries/zed/blob/d290da7dac922fdc67c4774cdd371fba23fe62e3/crates/languages/src/vtsls.rs#L178-L188

Either of these 3 properties may return `\n` (or multiple) in it,
spoiling Zed's completion menu, which uses `UniformList` to render those
items: a uniform list uses common, minimum possible height for each
element, and `\n` bloats that overly.

Good approach would be to use something else:
https://github.com/zed-industries/zed/issues/21403 but that has its own
drawbacks and relatively hard to use instead (?).

We could follow VSCode's approach and move away all but `label` from
`CodeLabel.text` to the side, where the documentation is, but that does
not solve the issue with `details` having newlines.

So, for now, sanitize all labels and remove any newlines from them. If
newlines are found, also replace whitespace sequences if there's more
than 1 in a row.

Later, this approach can be improved similarly to how Helix and Zed's
inline completions do: rendering a "ghost" text, showing the
completion's edit applied to the editor.

Release Notes:

- Fixed completion labels becoming overly large due to LSP completion
items with newlines

Updates #21927
Replaces https://github.com/zed-industries/zed/pull/22904
Closes #8580

Adds actions (default keybinds with emacs keymap):
- editor::SetMark (`ctrl-space` and `ctrl-@`)
- editor::ExchangeMark (`ctrl-x ctrl-x`)

Co-Authored-By: Peter <peter@zed.dev>

Release Notes:

- Add Emacs mark mode (`ctrl-space` / `ctrl-@` to set mark; `ctrl-x
ctrl-x` to swap mark/cursor)
- Breaking change: `selection` keyboard context has been replaced with
`selection_mode`

---------

Co-authored-by: Peter <peter@zed.dev>

| Before | After |
|--------|--------|
| <img width="1328" alt="Screenshot 2025-01-21 at 11 20 49 AM"
src="https://github.com/user-attachments/assets/ad8e3017-122a-4ebd-b1f5-5eb41cc3725a"
/> | <img width="1328" alt="Screenshot 2025-01-21 at 11 19 39 AM"
src="https://github.com/user-attachments/assets/a0dcbd52-6aca-43fa-97ee-6efde15c8bc1"
/> |

Release Notes:

- N/A

Follow up to https://github.com/zed-industries/zed/pull/22658

This PR ensures the background and border color of a project panel entry
is exactly the same with one exception: if the item is focused, active,
and not with mouse down. The point is to not be able to see the border
at all given they're there to act sort of akin to CSS's `outline` (which
doesn't add up to the box model).

Please let me know if there is any edge case I either messed up here or
didn't account for.


https://github.com/user-attachments/assets/29c74f6a-b027-4d19-a7de-b9614f0d7859

Release Notes:

- N/A

This unblocks work on #22182; a single language server might actually be
required by multiple languages (think of e.g. C/C++,
Javascript/Typescript), in which case it doesn't make sense to use a
single grammar. We already use primary language of a buffer for
highlights and this PR makes this the only supported syntax highlighting
flavour for returned symbols.

Closes #ISSUE

Release Notes:

- N/A

If a suggested edit is a single character insert or a single line
deletion, we'll show the diff popover to make it stand out more.

Release Notes:

- N/A

Co-authored-by: Danilo <danilo@zed.dev>

Closes #22883

To fix the problem, we move `handle_rename_project_entry` from
`Worktree` to `LspStore` and register it there. This way it becomes
available both in local and headless projects and this avoids the
duplication.

Release Notes:

- Fixed renaming project entries in Remote Development

Also fixes issue introduced in #23113 where changes to keyboard layout
would not cause reload of keymap configuration.

Closes #20531

Release Notes:

- N/A

I've noticed an occasional error: `ignoring event C:\some\path\to\file
outside of root path \\?\C:\some\path`. This happens because UNC paths
always fail to match with non-UNC paths during operations like
`strip_prefix` or `starts_with`. To address this, I changed the types of
some key parameters to `SanitizedPath`. With this adjustment, FS events
are now correctly identified, and under the changes in this PR, the
`test_rescan_and_remote_updates` test also passes successfully on
Windows.

Release Notes:

- N/A

`@mention`ed files in assistant2 now get replaced by the full path of
the file in what gets sent to the model, while rendering visually as
just the filename (in a crease, so they can only be selected/deleted as
a whole unit, not character by character).


https://github.com/user-attachments/assets/a5867a93-d656-4a17-aced-58424c6e8cf6

Release Notes:

- N/A

---------

Co-authored-by: João Marcos <joao@zed.dev>
Co-authored-by: Conrad <conrad@zed.dev>

Closes #23015

Release Notes:

- Improved which keybindings are selected for display. Now later entries
within `bindings` will take precedence. The default keymaps have been
updated accordingly.