vinod akshatandKirill Bulatov
97c3168848
# Objective Fixes #62524 This bug was introduced in a regression from #61487, which fixed horizontal autoscroll for multi-row selections (word wrap off) by computing target_left/target_right from the selection's actual start/end instead of just head.That fix changed target_left/target_right from always being a single point (head's column) to spanning the full selection width. This tripped an existing guard (if target_right - target_left > viewport_width { return None; }) whenever a selection was wider than the viewport, previously dead code, since target_left/target_right were never far apart before #61487. The function now bails out before adjusting scroll at all in that case. ## Solution In `autoscroll_horizontally`, compute the selection's span width per row. If it exceeds the viewport width, fall back to tracking just head (the pre-#61487 behavior) instead of the full start/end span. If it fits, keep using the full span so the #61409 fix is unaffected. ## Testing - Did you test these changes? If so, how? - Tested manually in-app on macOS: selecting a long line with cmd+shift+end now scrolls correctly. (NOTE: I used Claude to write these unit tests for me) - Added test_autoscroll_horizontally_long_selection_tracks_cursor: selects a 250-character line in a narrow viewport and asserts the scroll position moves to follow the cursor, instead of staying frozen at 0. - Added test_autoscroll_horizontally_fitting_selection_reveals_full_span: selects a short span that fits within the viewport and asserts the full span is revealed, confirming the #61409 fix still holds. - Ran the full editor test suite locally (cargo test --package editor --lib), all passing. ## Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and reliability - [ ] Unsafe blocks (if any) have justifying comments - [ ] The content adheres to Zed's UI standards ([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) and [icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md) guidelines) - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable --- Release Notes: - Fixed horizontal scroll not following the cursor when selecting a line longer than the viewport width --------- Co-authored-by: Kirill Bulatov <kirill@zed.dev>
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