Closes #ISSUE

Measure the model reversing user edits programatically, for a more
robust and consistent measurement than LLM-as-judge

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Release Notes:

- N/A

Closes #ISSUE

Release Notes:

- N/A

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- N/A

Prevents unbounded grown of the `hang_traces` directory.

Release Notes:

- Fixed excessive disk space usage from the `hang_traces` directory.

This essentially reverts 2a83c6907cf0850ad425f97b8debdd7bdf016a95 and
d35fee1cd131df90d1e14e06ec75f7d1c0a3bcf6

Release Notes:

- N/A

Fixes the `vim::ScrollUp/Down` commands when a normal-mode vim or helix
selection exists.

Pretty straightforward: make the `scroll_editor` function aware of the
current vim/helix mode, and only expand the selection if a visual mode
is active.

Closes #47022

Release Notes:

- Fixed bug causing normal-mode vim/helix selections to get expanded
during `vim::Scroll` commands

---------

Co-authored-by: dino <dinojoaocosta@gmail.com>

We were hitting some timeout failures with some runners, hence bumping
the size here.

Release Notes:

- N/A

Validate task variable names when the file is saved, immediately
displaying an error toast if any invalid `ZED_*` variables are found.
Valid tasks in the same file are still loaded and work normally.

- Add `task::task_template::TaskTemplate::unknown_variables()` to detect
  invalid `ZED_` variable names
- Add `project::ToastLink` struct and optional `link` field to
  `project::Event::Toast`
- Show documentation link in the error toast

Closes #23275

Release Notes:

- Fixed user-defined tasks with unresolved `ZED_*` variables being
silently omitted

---------

Co-authored-by: dino <dinojoaocosta@gmail.com>

Reduces time needed to build collab tests from 48s to 38s.

Release Notes:

- N/A

Closes ZED-4JM

Release Notes:

- N/A

Noticed we were calling session/list twice now, this makes sure it only
happens once on load

Release Notes:

- N/A

This improves the messaging around triggered releases and hopefully
should help with what needs to be done there.

Closes TRA-82.

Release Notes:

- N/A

Release Notes:

- N/A

Was changed by mistake

Release Notes:

- N/A

Co-authored-by: Lukas Wirth <me@lukaswirth.dev>

When I kill the remote proxy, it seems like `ssh` exits with code -1.
Since that's less than or equal to 0, this means we don't try to restart
the connection. The proxy really shouldn't exit for any reason, so let's
get rid of this check altogether.

Release Notes:

- N/A

Co-authored-by: Lukas Wirth <me@lukaswirth.dev>

Follow-up to #47649

Release Notes:

- N/A

Improve syntax highlighting of keywords by creating groups for
declarations and import/export.

### Release Notes:
- Highlight declarations with `keyword.declaration`:
  - const
  - let
  - var
  - function
  - class
  - enum
  - interface
  - type

- Highlight imports and exports with `keyword.import`:
  - export
  - from
  - import

---------

Co-authored-by: Gaauwe Rombouts <mail@grombouts.nl>

Removes the preview indicator from the docs, since this is available in
stable

Release Notes:

- N/A

Allows cancelling subagents

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Zed Zippy <234243425+zed-zippy[bot]@users.noreply.github.com>

With this, we can now ensure that snippet extensions we publish actually
only contain valid snippets.

Release Notes:

- N/A

The padding on folded directory path components was causing the first
component to be misaligned with regular entry labels. This adds a
negative margin to the first component to compensate for the left
padding while preserving the hover background.

Before:
<img height="180" alt="before-1"
src="https://github.com/user-attachments/assets/5be234a6-4fca-4940-a979-4cfb767875bb"
/> <img height="180" alt="before-2"
src="https://github.com/user-attachments/assets/1825e12b-eb55-48fe-9b3c-ac52e552581b"
/>

After:
<img height="180" alt="after-1"
src="https://github.com/user-attachments/assets/03b1029d-6664-49bd-9371-680fc912c67c"
/> <img height="180" alt="after-2"
src="https://github.com/user-attachments/assets/fa4954d7-796c-48f3-8f77-6aaee7bfc35c"
/>

Release Notes:

- Fixed alignment of folded directory names in project panel.

Expanded the nim entry to include `nims` and `nimble` files

- [nims](https://nim-lang.org/docs/nims.html) is a subscript of Nim that
runs in a VM
- [nimble](https://github.com/nim-lang/nimble) files are project files
for Nim that are written in Nim

Release Notes:

- Updated Nim file aliases so icon is shown for nims/nimble files

Release Notes:

- N/A

Also standardizes the list format in the prompt

Release Notes:

- N/A

Allows for the acp adapter to use terminal auth for this as well

Release Notes:

- N/A

Also ensured that we clear only the highlights of the current view
(which probably would have been the the case almost always anyway).

Release Notes:

- Fixed a small issue where highlights of the syntax tree view would
persist after the view was closed.

Release Notes:

- N/A

The client has not yet setup its own side of things so the message will
always error as being unhandled anyways.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Reverts zed-industries/zed#47599

The link here was intentional and linking to a file within GPUI, hence
reverting.

Release Notes: 

- N/A

Release Notes:

- N/A


Avoids iterating through all registered actions when looking up a single
action's schema in json_schema_store.

---------

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>

Closes #47303 

The command quoting for `cmd` shell was first introduced (at least in
this case) in PR #41216 three months ago:

https://github.com/zed-industries/zed/blob/3d4582d4dc9145270650e12f9ce5a534b888f4a2/crates/project/src/terminals.rs#L202-L210

And a month ago, PR #42382 added command quoting for `cmd` in a
different place:

https://github.com/zed-industries/zed/blob/3d4582d4dc9145270650e12f9ce5a534b888f4a2/crates/util/src/shell.rs#L413-L434

As a result, the command is now quoted twice when using `cmd`. `cmd`
interprets the entire double-quoted string (e.g., ""command & args"") as
a single (invalid) executable name, and this would lead to an error like
“The system cannot find the path specified” in #47303 .

The solution is to remove the redundant manual quoting in `terminals.rs`
and rely on the centralized logic in `util/src/shell.rs`.

/cc @Veykril @reflectronic 

Release Notes:

- Fixed a bug where terminal tasks failed to start on Windows when using
`cmd.exe`.

Release Notes:

- Zed now removes older cached remote server downloads

---------

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>

`compare_hunks` was emitting an incorrectly small range for
`base_text_byte_range` in some cases.

Release Notes:

- N/A

Release Notes:

- N/A

---------

Co-authored-by: Zed Zippy <234243425+zed-zippy[bot]@users.noreply.github.com>

Release Notes:

- N/A

Release Notes:

- N/A

---------

Co-authored-by: Zed Zippy <234243425+zed-zippy[bot]@users.noreply.github.com>

Building project tests takes 6.5s instead of 18s that way.

Release Notes:

- N/A

---------

Co-authored-by: Zed Zippy <234243425+zed-zippy[bot]@users.noreply.github.com>

old link redirects to a non-existing page showing '404 - page not
found', probably referring to `src/_ownership_and_data_flow.rs`. anyway
I put the official article link

Release Notes:
- N/A

## Summary

Fixes #47540 - Anthropic Claude models not appearing in GitHub Copilot
Chat model picker.

## Problem

Users reported that Anthropic Claude models (Claude Sonnet 4, Claude
Opus 4, etc.) were not appearing in the model picker when using GitHub
Copilot Chat, even though:
- The GitHub Copilot API returns these models
- The models have `model_picker_enabled: true`
- Users have valid Copilot subscriptions with access to these models

## Root Cause

The issue was in the `ModelSupportedEndpoint` enum deserialization. The
enum only defined two variants:

```rust
pub enum ModelSupportedEndpoint {
    #[serde(rename = "/chat/completions")]
    ChatCompletions,
    #[serde(rename = "/responses")]
    Responses,
}
```

Anthropic Claude models use the `/v1/messages` endpoint, which wasn't
defined. When deserializing the API response, serde failed with:

```
Error("unknown variant `/v1/messages`, expected `/chat/completions` or `/responses`")
```

Because the crate uses resilient deserialization via
`deserialize_models_skip_errors()`, the entire Claude model was silently
skipped rather than causing a hard failure. This meant users saw no
error - the models simply didn't appear.

## Solution

### 1. Added `/v1/messages` endpoint variant

```rust
pub enum ModelSupportedEndpoint {
    #[serde(rename = "/chat/completions")]
    ChatCompletions,
    #[serde(rename = "/responses")]
    Responses,
    #[serde(rename = "/v1/messages")]
    Messages,  // NEW: Anthropic models use this endpoint
    #[serde(other)]
    Unknown,   // NEW: Future-proofing for unknown endpoints
}
```

### 2. Removed incorrect `dedup_by()` call

The previous code deduplicated models by family:

```rust
.dedup_by(|a, b| a.capabilities.family == b.capabilities.family)
```

This incorrectly filtered out model variants that share the same family
(e.g., `claude-sonnet-4` and `claude-sonnet-4-thinking`). Removed this
call to preserve all model variants.

### 3. Removed unused import

Removed `use itertools::Itertools;` which was only used for the
now-removed `dedup_by()`.

## Changes

| File | Change |
|------|--------|
| `crates/copilot_chat/src/copilot_chat.rs` | Added `Messages` and
`Unknown` variants to `ModelSupportedEndpoint` enum |
| `crates/copilot_chat/src/copilot_chat.rs` | Removed `.dedup_by()` call
that incorrectly filtered models |
| `crates/copilot_chat/src/copilot_chat.rs` | Removed unused
`itertools::Itertools` import |
| `crates/copilot_chat/src/copilot_chat.rs` | Added 8 new unit tests |

## Test Coverage

Added 8 new unit tests to ensure the fix works and prevent regression:

| Test | Purpose |
|------|---------|
| `test_models_with_pending_policy_deserialize` | Verifies models with
non-"enabled" policy states deserialize correctly (they're filtered
later) |
| `test_multiple_anthropic_models_preserved` | Verifies multiple Claude
models are not incorrectly deduplicated |
| `test_models_with_same_family_both_preserved` | Verifies models
sharing the same family (e.g., thinking variants) are both preserved |
| `test_mixed_vendor_models_all_preserved` | Verifies models from
different vendors (OpenAI, Anthropic, Google) are all preserved |
| `test_model_with_messages_endpoint_deserializes` | **Critical test**:
Verifies `/v1/messages` endpoint deserializes correctly |
| `test_model_with_unknown_endpoint_deserializes` | Verifies unknown
future endpoints deserialize to `Unknown` variant |
| `test_model_with_multiple_endpoints` | Verifies models with multiple
endpoints deserialize correctly |
| `test_supports_response_method` | Verifies the `supports_response()`
method logic for endpoint routing |

### Test Results

```
running 10 tests
test tests::test_model_with_messages_endpoint_deserializes ... ok
test tests::test_model_with_multiple_endpoints ... ok
test tests::test_model_with_unknown_endpoint_deserializes ... ok
test tests::test_models_with_pending_policy_deserialize ... ok
test tests::test_models_with_same_family_both_preserved ... ok
test tests::test_mixed_vendor_models_all_preserved ... ok
test tests::test_multiple_anthropic_models_preserved ... ok
test tests::test_resilient_model_schema_deserialize ... ok
test tests::test_supports_response_method ... ok
test tests::test_unknown_vendor_resilience ... ok

test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
```

## How to Test Manually

1. Sign in to GitHub Copilot in Zed
2. Open the model picker (Agent panel → model selector dropdown)
3. Verify that Anthropic Claude models appear in the list:
   - Claude Sonnet 4
   - Claude Opus 4
   - Other Claude variants (if enabled in your GitHub Copilot settings)

## Checklist

- [x] Code compiles without errors
- [x] `./script/clippy --package copilot_chat` passes with no warnings
- [x] All unit tests pass
- [x] Change is focused on a single bug fix
- [x] No unrelated refactoring or feature additions


<img width="320" height="400" alt="Screenshot 2026-01-24 at 11 57 21 PM"
src="https://github.com/user-attachments/assets/d5e17e1b-da80-4f4d-a218-d50d35114a21"
/>


Release Notes:

- Fixed Anthropic models not appearing in the Copilot Chat model picker

---------

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>

Closes #38168
Closes #42414

We were already using `ExitStatusExt::from_raw()` to construct an
`ExitStatus`, but we were passing in the exit code from
alacritty_terminal's `ChildExit` event. This worked fine on Windows
where `from_raw()` expects an exit code, but on Unix, `from_raw()`
([read
more](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw))
expects a raw wait status from `waitpid()` and not an exit code.

When a child process was killed by a signal (e.g., SIGSEGV),
`ExitStatus::code()` returns `None` since only normal exits have an exit
code. This caused the terminal to hang because we weren't properly
detecting the exit.

One fix would have been to remove the dependency on `ExitStatus`
entirely, but using the raw wait status gives us more information, we
can now detect exit codes, signal terminations, and more.

The actual fix was upstream in `alacritty_terminal` to send the raw wait
status instead of just the exit code.

Currently using forked patch
https://github.com/zed-industries/alacritty/tree/v0.16-child-exit-patch
which is based on v0.25.1.

Upstream PR: https://github.com/alacritty/alacritty/pull/8825

Release Notes:

- Fixed terminal hanging when a child process is killed by a signal
(e.g., SIGSEGV from null pointer dereference).

Mirrors
https://github.com/zed-industries/zed/commit/3d4582d4dc9145270650e12f9ce5a534b888f4a2.
We skip setting language on the secondary diff buffer which is not
needed and will improve performance and memory usage.

Release Notes:

- Improved memory usage of large ACP thread diff multibuffers.

Fixes an issue where edits would be shown like this:

<img width="1262" height="1072" alt="image"
src="https://github.com/user-attachments/assets/f3ec865a-4bf2-423c-8465-62a54a21a882"
/>

When they should be like this:

<img width="1260" height="388" alt="image"
src="https://github.com/user-attachments/assets/ac555a25-f222-48aa-b922-0ae5b9f4e260"
/>


Release Notes:

- N/A *or* Added/Fixed/Improved ...

Release Notes:

- N/A

Closes https://github.com/zed-industries/zed/issues/33748

Release Notes:

- Windows is now supported as a target platform for SSH remoting.

---------

Co-authored-by: Lukas Wirth <me@lukaswirth.dev>

- Adds missing diagonal resize cursor mappings (NWSE/NESW) on Windows.
- Fixes `CursorStyle::ResizeUpLeftDownRight` and `ResizeUpRightDownLeft`
falling back to Arrow.

Release Notes:

- N/A

Closes [#ISSUE](https://github.com/zed-industries/zed/issues/20696)

Release Notes:

- Hide block cursor text when the cursor is within a redacted range

Screenshot:

<img width="434" height="174" alt="image"
src="https://github.com/user-attachments/assets/5d9dc140-7abe-49a8-823a-58deb0e170dc"
/>

Skipping setting the language on the git index text buffer improves
snappiness for (very) large git diff multibuffers and also significantly
lower peak and steady-state RSS. When tested on the chromium repo with
`git reset HEAD~1000` and *all* language extensions installed we notice:
* current `main`: peak RSS ~45GB, ss RSS ~39GB
* this patch: peak RSS ~30GB, ss RSS ~27GB

Release Notes:

- Improved memory usage of large git diff multibuffers.

Addressing the feedback left on a previous PR of mine:
https://github.com/zed-industries/zed/pull/46663. I feel like this is
worthy of a setting. Note, however, that this does not apply to typing
`ctrl-c` in the terminal from within the agent panel; this is purely
controlling what happens when you click on the "Stop" button in the
terminal tool call card.

Release Notes:

- Agent: Added a setting for controlling the behavior of the stop button
in the terminal tool call card (between cancelling the command to run
and the thread, or just the command).