[Ectropy]

The timeline minimap (horizontal scroll bar) was capped at 78px and pinned to the bottom-right of the timeline card. That made it hard to see or use as a scroll bar. This sizes it to the ruler width, so it runs from the track gutter to the card's right edge. It works much like the horizontal scroll bar in DaVinci Resolve, which spans the full width of the area directly below the tracks but doesn't extend beneath the track names.

The 78px corner placement came in with ae19682 (it was full-width along the top when first added in 0c24101). If the small size was intentional, I'm happy to close this.

• minimap_bounds now returns the full ruler span. The drawn bar and the click/drag hit area both use it, so they stay aligned.
• Added the_minimap_spans_the_ruler. The existing minimap drag tests pass.
• GPUI only. The legacy Tauri editor is unchanged.
• Tested on Windows 11 Pro in a dev build: dragging the chip, resizing it from both edges, and clicking the empty track to center the view on that point.

Fixes #2874.

Written with Opus 5.5 High. Reviewed and tested by me.

Confidence Score: 5/5

This PR appears safe to merge.

Summary

Expands the GPUI timeline minimap from its 78px corner placement to the full ruler width.

• The GPUI minimap now spans the full ruler beneath the tracks.

_{Reviews (5) · Last reviewed commit: "fix(editor): span the timeline minimap a..." · Reviewed by Greptile}

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[richiemcilroy]

Thanks! Can you get Greptile to 5/5 on the latest commit and get CI green? Then we'll take a look.

[superagent-security]

Superagent found 1 security concern(s).

[Ectropy]

@greptileai review

[Ectropy]

@richiemcilroy
As green as it can get, I think. The failing "Linux desktop reliability / Record on Hyprland (pull_request)" seems to be a pre-existing CI failure that other recent PRs are hitting.

I've tested the Editor personally, and it appears to still behave as expected

[Ectropy]

@greptileai review

[Ectropy]

@greptileai review

[richiemcilroy]

Thanks! Can you get Greptile to 5/5 on the latest commit? Then we'll take a look.

[Ectropy]

@greptileai review

[Ectropy]

@richiemcilroy Greptile 5/5 on latest commit. Ready for your look