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feat(app): magnetic snap zones and visual feedback on resize handle drag (#1434) #1612
Description
Important
Problem — Dragging the resize handle has no snap feedback. The user can drag to any pixel position but there's no "magnetic" pull toward useful positions (50/50, full, default), no visual indicator of what will happen if they release, and no subtle resistance at snap points. The double-click snap cycle exists but is hidden.
Approach — Add magnetic snap zones to the resize handle drag. When the drag position enters a snap zone (within ~20px of a snap target), the handle visually snaps to the target with a subtle indicator. Releasing inside the zone lands on the exact snap position. The snap targets: 50/50 split, full Preview (Chat collapses), and the default width (330px). A thin line or highlight at each snap position shows briefly during the drag.
Scope — In: snap zones during drag at 50/50, full, and default positions; visual snap indicator (line or highlight); smooth snapping behavior. Out: spring physics, animation on release (that's the transition issue), custom snap positions.
Acceptance Criteria
- During drag, the handle magnetically snaps to 50/50 split, full Preview, and default (330px) positions when within ~20px
- A subtle visual indicator (thin vertical line or background highlight) appears at snap positions during drag
- Releasing inside a snap zone lands on the exact snap position
- The snap zones have a slight resistance (the handle slows down as it approaches, not just jumps)
- Snapping to full Preview triggers Chat collapse; snapping back past 200px restores Chat
- The indicator disappears immediately when the drag exits a snap zone or ends
Reference
Figma's resizable panels: magnetic snap at useful positions. VS Code's sidebar snap at 0 (collapse). macOS window management snap zones.
Activity
aarontrowbridge commentedon Oct 29, 2026
Blocked on PR #1548 (Chat collapse and flexible split), which is deferred until after 0.4.0. This builds on it, so it's marked
hitlto keep the night runner off it until #1548 lands. (0.4.0 cleanup)