Closes #40269

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---

- Set `.SystemUIFont` as the GPUI default font.
- Add `Arial` to font fallback list.
- Add `Adwaita Sans` to default fallback list for Gnome.
- Move `Ubuntu` font to front of Gnome to make sure Ubuntu System takes
priority over `Ubuntu` font.

Our application get some crash report:

```
panicked at /Users/admin/.cargo/git/checkouts/zed-a70e2ad075855582/f1db3b4/crates/gpui/src/text_system.rs:150:9:
failed to resolve font 'Helvetica' or any of the fallbacks: Zed Plex Mono, Helvetica, Segoe UI, Cantarell, Ubuntu, Noto Sans, DejaVu Sans
```

This change to add `Arial` to fallback list, this font was included in
macOS and Windows.
Ref link (search "Arial"):

> Mac OS X (now known as [macOS](https://en.wikipedia.org/wiki/MacOS))
was the first Mac OS version to include Arial;
> https://en.wikipedia.org/wiki/Arial

- macOS Sequoia: https://support.apple.com/en-us/120414
- Windows 10:
https://learn.microsoft.com/en-us/typography/fonts/windows_10_font_list
- Gnome: https://developer.gnome.org/hig/guidelines/typography.html

Having the chevron to the side of the avatar is arguably unnecessary at
this point; most apps out there (Reddit, YouTube, etc.), including here
on GitHub, have the avatar without any icon, pointing to how there
doesn't seem to be a problem with knowing that there's a menu behind it.
Therefore, figured we could simplify the UI a bit more here.

This also looks better on platforms where the window controls are on the
right (Linux/Windows).

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Making all triggers have the same style when the picker is open
(including changing the icon when the picker opens on top of the
trigger). Also removed the footer from the ACP model selector given
there's nothing to consider when that's the case; users can only
configure LLM providers when using Zed's built-in agent.

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Updates #40212

v0.9.0 is now stable and contains the fix for the line endings bug, so
we can return to installing from the stable channel as usual. This also
bumps the minimum version on Windows to v0.9.0 so that anyone on v0.8.x
or v0.9.0-preview.4 will be upgraded automatically.

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Co-authored-by: Marshall Bowers <git@maxdeviant.com>

This PR improves the rendering performance of the Settings UI window by
using `gpui::list` to render only the visible contents of a settings
page, instead of rendering the full content of a page. This fixes a lag
that the editor page has in debug builds.

I also added a new field `measuring_behavior` to `ListState` that has
`Visible` and `Measured` variances. `Visible` only measures and caches
the bounds of visible items plus the overdraw pixel offset. `Measure`
will cache all items’ bounds on the first layout phase, which fixes
problems with the scrollbar size/position being miscalculated.

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---------

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

Closes #ISSUE

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

Closes #25564

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- Fix virtual env REPLs not showing up

This is the first towards better logs for adapter binaries. Next up I
intend to somehow allow `codelldb` adapter in Zed to permit simple log
level so that we can pass `RUST_LOG=level` when spawning the child
process.

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Makes the dropdown trigger button styling consistent with the other
buttons and allows to add a tooltip in the trigger through the popover's
`trigger_with_tooltip` method.

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Currently, using cmd-f or cmd-shift-f to search while a modal is active
(e.g. after cmd-t or cmd-p) doesn't do anything — you need to first
close the modal manually before initiating a search. This PR allows
these actions to run regardless of whether a modal is active.

Some context: VSCode lets you do this too, and for me it's quite common
to do a symbol search with cmd-t immediately followed by a regular
search with cmd-shift-f if I don't find what I'm looking for, so having
to close the modal first is slightly disruptive. cmd-t followed by cmd-p
does dismiss the project symbols modal in order to display the file
search modal, so it makes sense to me to also allow search actions to
dismiss an active modal.

Maybe this blunt fix has unintended consequences? If some types of
modals shouldn't be dismissed when running cmd-f, or some actions
shouldn't dismiss a currently active modal, then we'll have to go about
it differently.

Release Notes:

- Added the ability to run search actions when a modal is currently
active

Closes https://github.com/zed-industries/zed/issues/24670

(Follow up of https://github.com/zed-industries/zed/pull/36856) cc
@ConradIrwin Thanks for your help

Release Notes:

Fixed: Keep non project files when filtering in File finder

---------

Signed-off-by: Benjamin <5719034+bnjjj@users.noreply.github.com>
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>

Updating Zed Docs for Windows

---------

Co-authored-by: Kate <work@localcc.cc>
Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

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- Prevent using Zed before the auto-update bug when collaborating.

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We've been seeing the occasional `cannot seek backwards` panic within
`SelectionsCollection` without means to reproduce.

I believe the cause is one of the callers of
`MutableSelectionsCollection::select` not passing a well formed
`Selection` where `start > end`, so this PR enforces the invariant in
`select` by swapping the fields and setting `reversed` as required as
the other mutator functions already do that as well.

We could also just assert this instead, but it callers usually won't
care about this so its the less user facing annoyance to just fix this
invariant up internally.

Fixes ZED-253
Fixes ZED-ZJ
Fixes ZED-23S
Fixes ZED-222
Fixes ZED-1ZV
Fixes ZED-1SN
Fixes ZED-1Z0
Fixes ZED-10E
Fixes ZED-1X0
Fixes ZED-12M
Fixes ZED-1GR
Fixes ZED-1VE
Fixes ZED-13X
Fixes ZED-1G4

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- Fixed occasional panics when querying selections

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We seem to run into panics in related code, so better assert early

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Adds a new `NumberedLines` format which is similar to `MarkedExcerpt`
but each line is prefixed with its line number.

Also fixes a bug where contagious snippets wouldn't get merged.

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---------

Co-authored-by: Michael Sloan <mgsloan@gmail.com>
Co-authored-by: Michael <michael@zed.dev>

We were clearing the message editor too early. We only want to clear the
message editor if we are going to short circuit and return early before
submitting.
Otherwise, the agents that can handle this themselves won't have the
ability to do so.

Release Notes:

- acp: Fix /logout not working for some agents

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

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Fixes ZED-1YC
Fixes ZED-1YK

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

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- acp: Save default mode for codex

Windows not having a default shell does not matter here, we might still
have an environment from other means (by being spawned from the cli for
example).

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

No need to clutter the `--help` docs with default directories for
platforms other than the current one.

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Co-authored-by: David Kleingeld <davidsk@zed.dev>

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Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: John Tur <john-tur@outlook.com>

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Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: John Tur <john-tur@outlook.com>

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Follow-up to #39248 

- Correctly forward ports over SSH, including the port from the debug
scenario's `url`
- Give the companion time to start up, instead of bailing if the first
connection attempt fails

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- Fixed not being able to launch a browser debugging session in an SSH
project.

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Closes #ISSUE

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

---------

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

Related to https://github.com/zed-industries/zed/issues/38109

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Workaround for disagreement about line endings that's fixed in the
v0.9.0 series

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We automatically delete a local workspace if the folders comprising it
no longer exist.
If a local workspace points to folders in the WSL filesystem, checking
whether those folders exist will make us wait for the WSL VM and file
server to boot up. This can block Zed startup for many seconds.

Supported scenarios use remote workspaces, so delete these local
workspaces to ensure that we don't try to access their folders on the
startup path.

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- Fixes bug were typing `9999999999999999999j` (19 9's) would go up
instead of down
- Max Vim count is now isize::MAX - 1

Retrieval stats will now use polars to build a big data frame for
references with the cartesian product of LSP declarations and retrieved
declaration candidates (with all their score components) and rebuilds
the stats summary on top of it.

This data frame is written to a `.parquet` file, which we can load into
advanced analytics tools (such as Metabase), so we can explore our
scoring distributions and find ways to improve retrieval, and then train
the decision tree.

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---------

Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>

Fix issue where Zed would unconditionally override user's custom shell
with system default from passwd entry.

Closes https://github.com/zed-industries/zed/issues/40171

Release Notes:

- Fix issue where Zed would unconditionally override user's custom shell
with system default from passwd entry.

---------

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

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- N/A