This PR updates the `ContextPicker` entries to match on the
`ContextKind` instead of using strings.

Release Notes:

- N/A

![editor_scrollbars](https://github.com/user-attachments/assets/76c26776-8fe4-47f8-9c79-9add7d7d2151)

Closes #4427 

Release Notes:

- Added a horizontal scrollbar to the editor panel
- Added `axis` option to `scrollbar` in the Zed configuration, which can
forcefully disable either the horizontal or vertical scrollbar
- Added `horizontal_scroll_margin` equivalent to
`vertical_scroll_margin` in the Zed configuration

Rough Edges:

This feature seems mostly stable from my testing. I've been using a
development build for about a week with no issues. Any feedback would be
appreciated. There are a few things to note as well:

1. Scrolling to the lower right occasionally causes scrollbar clipping
on my end, but it isn't consistent and it isn't major. Some more testing
would definitely be a good idea. [FIXED]
2. Documentation may need to be modified
3. I added an `AxisPair` type to the `editor` crate to manage values
that have a horizontal and vertical variant. I'm not sure if that's the
optimal way to do it, but I didn't see a good alternative. The `Point`
type would technically work, but it may cause confusion.

---------

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

This PR fixes an issue where we were attaching empty message content
even if there was no context.

Release Notes:

- N/A

This PR adds spacing between entries in the historical threads view:

<img width="1371" alt="Screenshot 2024-12-17 at 10 51 26 AM"
src="https://github.com/user-attachments/assets/f66d69e9-eb59-4c76-b3b5-c4d60190c3cc"
/>

Release Notes:

- N/A

This makes inline completions show up in the completion menu even if the
user has set `"show_completion_documentation": false` in their settings,
because there is no other way to show the Zeta completion.

Follow-up to #22093

Release Notes:

- N/A

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

In different parts of the app, but all of them can be seen in the
screenshot below:

<img width="800" alt="Screenshot 2024-12-16 at 21 31 51"
src="https://github.com/user-attachments/assets/79c0ad5e-4e4c-469d-93a1-fd4e707d4aaa"
/>

Release Notes:

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

Screenshot:

![screenshot-2024-12-17-11 53
41@2x](https://github.com/user-attachments/assets/bace3d20-7175-4833-9326-7b859166c0e8)

Demo:


https://github.com/user-attachments/assets/70197042-4785-4e45-80fd-29d12e68333f



(Note for Joseph/Peter: this supersedes
https://github.com/zed-industries/zed/pull/22069)

Release Notes:
- Changed inline completions to show up inside the normal completions in
case LSP and inline-completions are available. In that case, the inline
completion will be the first entry in the menu and can be selected with
`<tab>`.

---------

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

Follow-up of https://github.com/zed-industries/zed/pull/22082

Release Notes:

- N/A

Release Notes:

- N/A

Closes #20205

Release Notes:

- Added `MoveItemToPane` and `MoveItemToPaneInDirection` actions

---------

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

This reverts commit 38c0aa303e8c58238bceea9ee719ef2716158e81 from
#22075.

Release Notes:

- N/A

* Makes `dilate` and `inset` return.

* Implements `Add<Point<T>>` and `Sub<Point<T>>`.

* Makes some trait constraints more precise.

* Now decides whether the menu is above or below the target position
before rendering it. This causes its position to no longer vary
depending on the length of completions

* When the text area is height constrained (< 12) lines, now chooses the
side which has the most space. Before it would always display above if
height constrained below.

* Misc code cleanups

Release Notes:

- Improved completions menu layout to be more stable and use available
space better.

Release Notes:

- N/A

This PR makes it so `assistant` and `assistant2` both use the same
action for inline assist (`zed_actions::InlineAssist`).

This makes it so the keybindings to deploy the inline assist seamlessly
swap based on the feature flag without needing to rebind them.

One minor caveat: if you're using `assistant2` the action name in the
command palette will be `assistant: inline assist`.

Release Notes:

- N/A

This PR adds an action and associated keybinding
(<kbd>Cmd+Shift+A</kbd>) to toggle the context picker.

This allows for adding context via the keyboard.

Release Notes:

- N/A

To treat the case for whenever the assistant panel gets small.

<img width="360" alt="Screenshot 2024-12-16 at 20 12 34"
src="https://github.com/user-attachments/assets/5426a5b9-9baf-41e3-a2c6-2f997378c994"
/>

Release Notes:

- N/A

Release Notes:

- N/A

This PR adds a keybinding to toggle the `LanguageModelSelector` in
Assistant2.

Release Notes:

- N/A

This PR makes `ListItem`s with `outlined` set use the same rounding for
their hover state to ensure that the hover background doesn't bleed
outside of the outline.

Release Notes:

- N/A

This PR adds a `text_ellipsis` method to `Label`s.

This can be used to truncate the text with an ellipsis without needing
to wrap the `Label` in another element.

Release Notes:

- N/A

This is good for code sharing but also sets up #22102 for making
assumptions about popover y padding.

Release Notes:

- N/A

This PR makes the language model selector in the Assistant2 panel
persist the model changes to the settings.

Release Notes:

- N/A

This PR ensures that the remove buttons on the `ContextPill`s are
uniquely identified.

Release Notes:

- N/A

This suggest the [Cython
extension](https://github.com/lgeiger/zed-cython) for syntax
highlighting of Cython files.

Release Notes:

- Suggest Cython extension for syntax highlighting of `.pyx`, `.pxd` and
`.pxi` files

This PR adds the ability to resize the Assistant2 panel.

Release Notes:

- N/A

Follow-up of https://github.com/zed-industries/zed/pull/22046

Properly [un]fold blocks based on the selections

<img width="1728" alt="image"
src="https://github.com/user-attachments/assets/73f319ee-3005-4a3b-95ee-4c6deb5cd0b8"
/>


Release Notes:

- N/A

Mostly minor tweaks to make it closer to the prototype. More to come.

| With message | Empty state |
|--------|--------|
| <img width="1420" alt="Screenshot 2024-12-16 at 18 59 40"
src="https://github.com/user-attachments/assets/5df791bf-577a-4f01-9045-80568604099f"
/> | <img width="1420" alt="Screenshot 2024-12-16 at 18 59 33"
src="https://github.com/user-attachments/assets/adbf1673-3040-4b2b-8d65-f8b38a83c1d0"
/> |

Release Notes:

- N/A

This PR updates up the context picker for the terminal's inline assist.

Release Notes:

- N/A

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

Ref
https://github.com/zed-industries/zed/issues/21994#issuecomment-2545988779,
`language` is already deprecated but was still suggested in the docs
here.

Release Notes:

- N/A

Follow-up of https://github.com/zed-industries/zed/pull/22046

Release Notes:

- N/A

Co-authored-by: Bennet <bennet@zed.dev>

This is a pure refactor, extracted from
https://github.com/zed-industries/zed/tree/new-diff-map

Release Notes:

- N/A

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

This PR wire up the context picker with the inline assist.

UI is not finalized.

Release Notes:

- N/A

---------

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

`rev` is the preferred key

Most notably, adding the `outlined` property in the `ListItem`
component.

<img width="800" alt="Screenshot 2024-12-13 at 20 35 39"
src="https://github.com/user-attachments/assets/adac4463-66f9-4b5e-b1c0-93c34f068dc4"
/>

Release Notes:

- N/A

`todo!()` -> `TODO`

Release Notes:

- N/A

This PR removes the optionality for the `WeakView<Workspace>` that we
pass to the inline assist.

This was always `Some` in practice, so it seems we don't need to have it
be an `Option`.

Release Notes:

- N/A

This PR factors a `ContextStrip` view out of the `MessageEditor` so that
we can use it in other places.

Release Notes:

- N/A

Follow-up of https://github.com/zed-industries/zed/pull/22004
Closes https://github.com/zed-industries/zed/issues/22078

Release Notes:

- Fixed splitting terminal items in the center

This PR adds the ability to reference other threads as context:

<img width="1159" alt="Screenshot 2024-12-16 at 11 29 54 AM"
src="https://github.com/user-attachments/assets/bb8a24ff-56d3-4406-ab8c-6657e65d8c70"
/>

<img width="1159" alt="Screenshot 2024-12-16 at 11 29 35 AM"
src="https://github.com/user-attachments/assets/7a02ebda-a2f5-40e9-9dd4-1bb029cb1c43"
/>


Release Notes:

- N/A

Pretty sure this isn't meant to be kebab-case.

Release Notes:

- N/A

- Ensuring that the fold button is big enough to avoid clicking on the
header as a whole (and then moving to the actual file)
- Adding tooltips to the fold button
- Refining the container structure so that the tooltip for the folder
button and the header click don't overlap
- Adding keybindings to tooltips


https://github.com/user-attachments/assets/82284b59-3025-4d6d-b916-ad4d1ecdb119

Release Notes:

- N/A

Follow-up of https://github.com/zed-industries/zed/pull/22004 

* Reuse center terminals for tasks, when requested
* Extend task templates with `RevealTarget`, moving it from
`TaskSpawnTarget` into the core library
* Use `reveal_target` instead of `target` to avoid misinterpretations in
the task template context
* Do not expose `SpawnInTerminal` to user interface, avoid it
implementing `Serialize` and `Deserialize`
* Remove `NewCenterTask` action, extending `task::Spawn` interface
instead
* Do not require any extra unrelated parameters during task resolution,
instead, use task overrides on the resolved tasks on the modal side
* Add keybindings for opening the task modal in the
`RevealTarget::Center` mode

Release Notes:

- N/A

This is related to #22069 and #21858: before both of these PRs, we would
only ever show inline completions OR completions, never both at the same
time.

Now we show both at the same, but we still had this piece of logic here,
that prevented non-inline completions from showing up if there was
already an inline completion.

With this change, it's possible to get LSP completions without having to
dismiss inline completions before.

Release Notes:

- Inline completions (Copilot, Supermaven, ...) don't stop other
completions from showing up anymore. Both can now be visible at the same
time.

---------

Co-authored-by: Bennet <bennet@zed.dev>

Happened to see that the doc comments here were not correct while
implementing something else.

Release Notes:

- N/A

Closes #22072

Clicking on the remaining space now allows a single click to deselect
all selected items. Check the issue for a preview of the current state
and how it works in VSCode.

Bonus: I found the hover color on selected items to be distracting. When
I have many entries selected and hover over them, it becomes hard to
tell if a particular entry is selected while the mouse pointer is on it.
This PR removes hover coloring for selected entries, mimicking how
VSCode handles it.

This PR:
<img
src="https://github.com/user-attachments/assets/9c4b20fc-df93-4868-b7fe-4045433e85b2"
alt="zed" width="450px" />

Release Notes:

- Clicking on empty space in the Project Panel now deselects all
selected items.

I'm not sure about this yet.

On one hand: it's nice that the completion doesn't just disappear when I
hit escape because I was typing and in the flow.

On the other hand: no other inline completion provider keeps the
suggestion when leaving insert mode.

I'm going to merge this so we can get it into nightly and try it out for
the next couple of days. cc @ConradIrwin

Release Notes:

- vim: Do not dismiss inline completions when leaving insert/replace
mode with `<esc>`.

https://github.com/user-attachments/assets/4ce806f1-d790-41d0-9825-e68055281446

Release Notes:

- N/A

This reverts part of #21858 by changing how `tab` works again:

- If both, completions and inline completions, are visible, then `tab`
accepts the completion and `shif-tab` the inline completion.
- If only one of them is shown, then `tab` accepts it.

I'm not a fan of this solution, but I think it's a short-term fix that
avoids breaking people's `tab` muscle memory.

Release Notes:

- (These release notes invalidate the release notes contained in:
https://github.com/zed-industries/zed/pull/21858)
- Changed how inline completions (Copilot, Supermaven, ...) and normal
completions (from language servers) interact. Zed will now also show
inline completions when the completion menu is visible. The user can
accept the inline completion with `<shift-tab>` and the active entry in
the completion menu with `<tab>`.