Reproduction steps

1. Start Zed
2. Open any Markdown file (I chose this repository's README.md)
3. Move cursor 2 lines below any heading
4. Notice how the sticky scroll breadcrumb does not display the heading anymore

Current vs. Expected behavior

Current behavior

It works on the exact heading line or always the empty line below.

But not anymore on any other lines down. Here I am on line 3 and the heading disappears from the sticky_scroll area, apparently:

Expected behavior

When under a Markdown heading, it should always show the closest top heading in the sticky_scroll area.

Not having it, makes it easy to lose track under which heading one is without invoking outline::Toggle.

Zed version and system specs

Zed: v0.217.3+stable.105.80433cb239e868271457ac376673a5f75bc4adb1 (Zed)
OS: macOS 15.6.1
Memory: 16 GiB
Architecture: aarch64

Attach Zed log file

No response

Relevant Zed settings

{
  "sticky_scroll": {
    "enabled": true
  }
}

Relevant Keymap

No response

(for AI issues) Model provider details

No response

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

None