These tests failed due to an indefinite hang in buffer.condition in the following code:
\`\`\`rust
    let buffer = cx
        .add_model(|cx| Buffer::new(0, cx.model_id() as u64, text).with_language(language, cx));
    buffer.condition(cx, |buf, _| !buf.is_parsing()).await;
`\`\`
In both gpui1 and gpui2 \`.with_language\` spawns a task that notifies the context once it's done. The \`condition\` waits for notifications to be raised. The gist of the problem was that in gpui2, the spawned task was scheduled straight away, so we never really saw the notification with \`condition\`, causing us to wait indefinitely. This is probably a difference in test between schedulers in gpui1 and gpui2, but I kind of sidestepped the issue by spawning a condition before firing off a parsing task with \`set_language\`.

- +language_selector2
- Language Selector 2 working!
- Prevent languages showing in wrong order first
- copilot_menu2 (though only tested offling, which is insufficient)
- Dismiss tooltips at capture
- Get ChannelModal opening

[[PR Description]]

Release Notes:

-  N/A

(Otherwise they stay open when you hover over the editor, which
stops mouse move events propagating)

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

Co-Authored-By: Max <max@zed.dev>

Without this, hitting cmd-n on the context menu in the project browser
invokes the workspace::NewFile action instead of the project::NewFile
action. We're considering changing the behavior so that bindings with no
context can only invoke global actions.

Co-Authored-By: Max <max@zed.dev>

Co-Authored-By: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>

[no-ci]

Co-Authored-By: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>

With this fix, auto-updates should work on nightly.

Co-Authored-By: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>

This fixes a bug where it was possible to put the channel tree into a
bad state by accidentally dragging a channel into itself or one of its
descendants.

This PR extends `Button` with support for an optional icon to be
displayed next to the label.

As part of this, the functionality for displaying an icon within a
button has been factored out into an internal `ButtonIcon` component.
`ButtonIcon` is now used by both `IconButton` and `Button` to
encapsulate the concerns of an icon that is rendered within a button.

Release Notes:

- N/A

This PR adds a new `selected_label` method to `Button`.

This can be used to set a different label that should be rendered when
the `Button` is selected.

Release Notes:

- N/A

This PR adds a new `selected_icon` method to `IconButton`.

This can be used to set a different icon that should be rendered when
the `IconButton` is selected.

Release Notes:

- N/A

See title

Release Notes:

- N/A

- Adds a placeholder `ButtonStyle::Tinted`.
  - Note: Using this now will just give you a block of `gpui::red()`
- Documents ButtonLike and ButtonStyle to hopefully help make choosing a
button style easier.

Release Notes:

- N/A