Currently we always compute breadcrumbs and sticky headers on every
editor paint which is not cheap to do especially in bigger files, moving
this off to be computed on event handling where they change and then
caching them can save serveral milliseconds per render in bigger files.
This also puts matching brackets refreshing and document highlights on a
background task, as this tends to block the main task for prolonged time
as well.
Release Notes:
- N/A *or* Added/Fixed/Improved ...
This branch:
1. teaches `--diff `command line option to to recurse into folders if
provided.
2. Adds a `MultiDiffView` that shows _all_ changed files in a single,
scrollable view.
This is necessary to provide a smooth user experience for `jj` and Zed
users who wish to use Zed as their jj difftool.
I'm not fully sure how this change interacts with
https://github.com/zed-industries/zed/pull/44936, or what plans y'all
have in mind.
Here's a screenshot of the resulting behavior:
<img width="1090" height="950" alt="Screenshot 2025-12-17 at 9 10 52 AM"
src="https://github.com/user-attachments/assets/8efd09b4-974f-4059-9f94-539c484c6d4a"
/>
I setup zed to handle jj diffs by adding the following to my jj config:
```toml
[aliases]
zdiff = ["diff", "--tool", "zed"]
[merge-tools.zed]
program = "/Users/dbarsky/Developer/zed/target/debug/cli"
# omit diff-invocation-mode to keep the default (JJ passes two dirs)
diff-args = [
"--zed", "/Users/dbarsky/Developer/zed/target/debug/zed",
"--wait",
"--new",
"--diff",
"$left",
"$right",
]
```
Release Notes:
- `--diff`, if provided with folders instead of files, will recurse into
those directories.
- Added a `MultiDiffView`, which will show all changed files within a
single, scrollable view.
**AI Disclosure**: Pretty much all of this code was written using Codex
with GPT-5.1-Codex. I edited by hand and tested this.
---------
Co-authored-by: Lukas Wirth <lukas@zed.dev>
Lukas Wirth