Single-file diff scrollbar no longer highlights changed regions

[anilzeybek]

Reproduction steps

1. Open a Git repository in Zed.
2. Modify multiple regions of a file, ideally with enough distance between the changes to create separate diff hunks.
3. Open the Git panel.
4. Select the modified file to open its single-file diff.
5. Leave the diff in the default changes-only view introduced by solo_diff_view: Show changes only by default #59958.
6. Inspect the scrollbar.

This started after #59958 was merged.

Current vs. Expected behavior

Current behavior:

The scrollbar in the single-file diff no longer highlights the locations of changed regions. This makes it harder to understand how changes are distributed throughout the file and to navigate between them.

Expected behavior:

The scrollbar should continue to show markers for changed regions, including when the diff is displayed in changes-only mode, as it did before #59958.

As a related usability concern, the changes-only view is now always the default. My workflow generally requires the full-file view, so I must click “Show full file” every time I open a file. It would be useful to have a setting that controls whether single-file diffs initially open in changes-only or full-file view.

Related discussion: #59958 (comment)

Zed version and system specs

Zed: v1.12.0+preview.325.a655175721b871d2d5718241db9c535fa38dfc92 (Zed Preview)
OS: macOS 26.4.1
Memory: 36 GiB
Architecture: aarch64

Attach Zed log file

Zed.log

Relevant Zed settings

settings.json

Relevant Keymap

keymap.json

(for AI issues) Model provider details

No response

If you are using WSL on Windows, what flavor of Linux are you using?

None

[zed-community-bot]

This issue appears to be a duplicate of:

• Open Diff (File) view scrollbar markers missing #60259

If this is indeed a duplicate:
Please close this issue and subscribe to the linked issue for updates (select "Close as not planned" → "Duplicate")

If this is a different issue:
No action needed. A maintainer will review this shortly.

Why were these issues selected?

#60259: Issue #60259 describes the exact same bug: opening a file's diff from the Git panel shows a completely empty scrollbar with no git diff markers or diagnostic indicators. The new issue #61255 reports the same missing scrollbar diff-region highlights in the single-file diff view, both tracing back to the changes introduced by PR #59958. The reproduction steps and observed behavior are identical.

Shared root cause: Scrollbar markers (diff highlights, diagnostics) missing in the single-file diff view opened from the Git panel

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_{This is an automated analysis and might be incorrect.}