## Summary
Fix subgraph node slot connector links appearing misaligned after
workflow load, caused by a transform desync between LiteGraph's internal
canvas transform and the Vue TransformPane's CSS transform.
## Changes
- **What**: Changed `syncNodeSlotLayoutsFromDOM` to use DOM-relative
measurement (slot position relative to its parent `[data-node-id]`
element) instead of absolute canvas-space conversion via
`clientPosToCanvasPos`. This makes the slot offset calculation
independent of the global canvas transform, eliminating the frame-lag
desync that occurred when `fitView()` updated `lgCanvas.ds` before the
Vue CSS transform caught up.
- **Cleanup**: Removed the unreachable fallback path that still used
`clientPosToCanvasPos` when the parent node element wasn't found (every
slot element is necessarily a child of a `[data-node-id]` element — if
`closest()` fails the element is detached and measuring is meaningless).
This also removed the `conv` parameter from `syncNodeSlotLayoutsFromDOM`
and `flushScheduledSlotLayoutSync`, and the
`useSharedCanvasPositionConversion` import.
- **Test**: Added a Playwright browser test that loads a subgraph
workflow with `workflowRendererVersion: "LG"` (triggering the 1.2x scale
in `ensureCorrectLayoutScale`) as a template (triggering `fitView`), and
verifies all slot connector positions are within bounds of their parent
node element.
## Review Focus
- The core change is in `useSlotElementTracking.ts` — the new
measurement approach uses `getBoundingClientRect()` on both the slot and
its parent node element, then divides by `currentScale` to get
canvas-space offsets. This is simpler and more robust than the previous
approach.
- SubgraphNodes were disproportionately affected because they are
relatively static and don't often trigger `ResizeObserver`-based
re-syncs that would eventually correct stale offsets.
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9121-fix-resolve-subgraph-node-slot-link-misalignment-during-workflow-load-3106d73d365081eca413c84f2e0571d6)
by [Unito](https://www.unito.io)
---------
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Alexander Brown <448862+DrJKL@users.noreply.github.com>
Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>
