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backlog/completed/task-20.1 - Refactor-overlay-runtime-to-use-per-layer-window-bounds-ownership.md

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+---
+id: TASK-20.1
+title: Refactor overlay runtime to use per-layer window bounds ownership
+status: Done
+assignee: []
+created_date: '2026-02-12 08:47'
+updated_date: '2026-02-13 08:04'
+labels: []
+dependencies: []
+parent_task_id: TASK-20
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Refactor overlay runtime so each overlay layer owns and applies its bounds independently. Keep tracker geometry as shared origin input only.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 `updateOverlayBoundsService` no longer applies the same bounds to every overlay window by default.
+- [x] #2 Main runtime/manager exposes per-layer bounds update paths for visible and invisible overlays.
+- [x] #3 Window tracker updates feed shared origin data; each layer applies its own computed bounds.
+- [x] #4 Single-layer behavior (visible-only or invisible-only) remains unchanged from user perspective.
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Started implementation for per-layer overlay bounds ownership refactor.
+
+Implemented per-layer bounds ownership path: visible and invisible layers now update bounds independently through overlay manager/runtime plumbing, while preserving existing geometry source behavior.
+
+Replaced shared all-window bounds application with per-window bound application service and layer-specific runtime calls from visibility/tracker flows.
+
+Archiving requested by user.
+<!-- SECTION:NOTES:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Refactored overlay bounds ownership to per-layer update paths. Tracker geometry remains shared input, but visible/invisible windows apply bounds independently via explicit layer routes. Existing single-layer UX behavior is preserved.
+<!-- SECTION:FINAL_SUMMARY:END -->