Picture worth a thousand words:


![before-after](https://github.com/zed-industries/zed/assets/482957/0aa92baf-f1cd-485e-a234-6d8f8b63a79a)

Note how having an area makes a substantial amount of frames between
0.5ms and 1ms faster (15-20% faster frames).

Release Notes:

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This is a trick borrowed from Bumpalo that helps LLVM understand
it should instantiate the object directly on the heap, as opposed to
doing so on the stack and then moving it.

* Follow command didn't work, because follow task was dropped
* An extra div prevented titlebar facepiles from rendering correctly

This PR fixes an issue where the scroll correction added to the uniform
list in a35fdf45fc9de57b7696c4deacbc62c49b26a516 was being applied even
if the list wasn't scrolled at all.

This manifested in the project panel starting with an incorrect scroll
offset that would disappear once scrolled.

It seems like we should only need to apply this scroll correction when
the list is already scrolled.

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This PR fixes the channel filter in the collab panel not showing up.

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This PR adds support for the `--release` flag to `script/zed-local`.

This allows you to run a local build of Zed in release mode, which can
be useful when needing to profile things or do other performance work.

Release Notes:

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* Fix a bug where a pane's leader info was not rendered if the pane was
part of a split
* Fix a crash when zooming a pane, due to duplicate render of that view.

Remove distinct code path for rendering panes in a PaneAxis, as this dropped
the logic for rendering the leader border and info box.

* [x] zoom
* [x] pane tests

[[PR Description]]

TODO: 
- [x] Style fold marker
- [x] Editor - Code action icon too large, should use muted color,
should have tooltip
- [ ] Style inline assistant
    - Prompt text gets cut off veritcally
- [x] Line height on inline assist editor isn't tall enough
- Nate: This is my fault due to the line height (relative: 1) we are
setting on non-buffer editors. I'll look into this.
- [ ] Style diagnostic hover (right now it's an opaque box on some
themes)
    - Nate: This needs status tints, we are working on it
- [ ] Hovering over a symbol shows a dialogue that appears underneath
the scroll-bar

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- Don't scroll beyond end of uniform list
- Restore position of uniform_list padding

[[PR Description]]

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In zed1, the array of commands was recalculated on every update_matches,
In zed2 it's cached before we change the focus.

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It should be inside the scrollable area.

This PR fixes an issue with the toolbar width introduced in #3666.

The lack of a flex container was making the toolbar contents not take up
the full width, and thus not positions items correctly along its main
axis.

Release Notes:

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This PR reworks the rendering of the collab panel to use `gpui::list`,
so that we don't render any items that are not visible on the screen.

In the process we also fixed some bugs in the channel list:

- Fixed the context menu for channels not deploying when activated via
keyboard
- Fixed drag and drop for channels
- Made it so when navigating the collab panel via keyboard the list only
scrolls enough to reveal the next item when navigating to an item that
is currently off-screen

Release Notes:

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[[PR Description]]

Release Notes:

-

Also add the ability to unnest a channel by dragging it to the "Channels"
header. This is currently not working due to a collab server issue.

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

In zed1, the array of commands was recalculated on every update_matches,
In zed2 it's cached before we change the focus.

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

Added a new `bounds_for_item` for `ListState`.

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

Release Notes:

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[[PR Description]]

Clean up titlebar design nits

- Remove red borders
- Update menu button styles
- Adjust padding
- Improve tooltips with keybindings

Release Notes:

- N/A