fix(apollo-react): keep auto-routed canvas edges orthogonal [MST-13255]

[KodudulaAshishUiPath]

Summary

• Fix the diagonal fallback in calculateAutoWaypoints by replacing the MIN_SEGMENT_LENGTH / 2 (16px) threshold with a real collinearity check at COLLINEAR_TOLERANCE (1px).
• Add regression coverage for slight endpoint displacement.

CanvasEdge could fall back to a diagonal path after a small node displacement. calculateAutoWaypoints skipped the mid-axis jog whenever the endpoints were within 16px on the cross-axis, so any offset from 1-16px rendered as a single diagonal rather than an orthogonal route. The check now skips the jog only when the endpoints are genuinely collinear (within 1px); every other offset gets a proper elbow pair.

Explicit and routed waypoint paths are unchanged.

Demo

Before:

Screen.Recording.2026-08-06.at.15.50.56.mov

After:

Screen.Recording.2026-08-06.at.15.50.08.mov

Validation

• vitest run src/canvas/components/Edges/ - 89 passed
• tsc --noEmit - clean
• Biome - clean on changed files

[github-actions]

Apollo Coded App preview deployments are ready.

Project	Status	Preview	Updated (PT)
apollo-design	Ready	Preview · Logs	Aug 07, 2026, 01:15:48 AM
apollo-docs	Ready	Preview · Logs	Aug 07, 2026, 01:15:48 AM
apollo-landing	Ready	Preview · Logs	Aug 07, 2026, 01:15:48 AM
apollo-vertex	Ready	Preview · Logs	Aug 07, 2026, 01:15:48 AM

[github-actions]

Dependency License Review

• ✅ 1950 package(s) scanned
• ✅ No license issues found
• ⚠️ 2 package(s) excluded (see details below)

License distribution

License	Packages
MIT	1720
ISC	89
Apache-2.0	55
BSD-3-Clause	27
BSD-2-Clause	23
BlueOak-1.0.0	8
MPL-2.0	4
MIT-0	3
CC0-1.0	3
MIT OR Apache-2.0	2
(MIT OR Apache-2.0)	2
Unlicense	2
LGPL-3.0-or-later	1
Python-2.0	1
CC-BY-4.0	1
(MPL-2.0 OR Apache-2.0)	1
Unknown	1
Artistic-2.0	1
(WTFPL OR MIT)	1
(BSD-2-Clause OR MIT OR Apache-2.0)	1
CC-BY-3.0	1
0BSD	1
(MIT OR CC0-1.0)	1
MIT AND ISC	1

Excluded packages

Package	Version	License	Reason
@img/sharp-libvips-linux-x64	1.3.2	LGPL-3.0-or-later	LGPL pre-built binary, not linked
khroma	2.1.0	Unknown	MIT per GitHub repo, missing license field in package.json

[Copilot]

Pull request overview

Aligns CanvasEdge rendering with SequenceEdge by using smooth-step routing for edges that have no explicit/routed waypoints, and tightens auto-waypoint behavior to avoid diagonal fallbacks after small endpoint displacements.

Changes:

• Treat routing: 'waypoint' + waypoints.length === 0 as a smooth-step path in useEdgeGeometry.
• Introduce shared collinearity detection (getCollinearAxis) and use it in calculateAutoWaypoints to preserve orthogonality for small endpoint offsets.
• Add regression tests to ensure buildPathVertices remains orthogonal under slight target displacement.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/apollo-react/src/canvas/components/Edges/shared/hooks/useEdgeGeometry.ts	Switches empty-waypoint waypoint routing to smooth-step path/label computation.
packages/apollo-react/src/canvas/components/Edges/shared/geometry.ts	Adds collinearity helper and updates auto-waypoint routing logic.
packages/apollo-react/src/canvas/components/Edges/shared/geometry.test.ts	Adds regression coverage for small endpoint offsets staying orthogonal.

[github-actions]

📊 Coverage + size by package

Per-package coverage and bundle size on this PR. New-line coverage = of the source lines this PR adds or changes, the % hit by tests.

Package	Coverage	New-line coverage	Packed (gzip)	Unpacked	vs main
@uipath/apollo-core	—	—	43.84 MB	57.45 MB	±0
@uipath/apollo-react	39.1%	50.0% (4/8)	7.51 MB	28.87 MB	+133 B
@uipath/apollo-wind	—	—	420.5 KB	2.73 MB	+10 B
@uipath/ap-chat	85.8%	—	43.46 MB	56.05 MB	±0

_{"Coverage" is each package's own coverage.include scope (e.g. apollo-core instruments only scripts/). "Packed"/"Unpacked" come from npm pack --dry-run and only cover built packages — "—" means not measured this run (package not affected / not built). "vs main" is the packed (gzipped) delta against the last successful main build (the package-sizes artifact from the Release workflow); "—" there means no main baseline was available this run. The baseline is main's latest build, not this PR's exact merge-base, so it includes any drift since the branch diverged. Packages with no vitest config are omitted.}

[github-actions]

Storybook visual diff

⚠️ Visual changes detected: 7 changed (of 300 compared, 293 unchanged). View report

Baseline is the deployed main Storybook, so changes merged to main after this branch was last updated can also appear here. Logs

Updated (PT): Aug 07, 2026, 01:31:46 AM

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

Suppressed comments (1)

packages/apollo-react/src/canvas/components/Edges/shared/hooks/useEdgeGeometry.ts:103

• isSmoothStepPath causes this hook to return the useEdgePath smooth-step output, but the waypoint pipeline still recomputes buildPathVertices/createRoundedPath whenever coordinates change. In read-only/non-edit mode (where enableSegments is false) this adds unnecessary per-render work for auto-routed edges.

  const isWaypoint = routing === 'waypoint';
  const isHandle = routing === 'handle';
  const isSmoothStepPath = isHandle || (isWaypoint && waypoints.length === 0 && !enableSegments);

  const pathPoints = useMemo(

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

Suppressed comments (1)

packages/apollo-react/src/canvas/components/Edges/shared/geometry.ts:36

• The JSDoc sentence has an unnecessary comma (“shares, when…”) which reads like a grammatical error and makes the description harder to parse.

/** The axis a source/target pair already shares, when both faces exit along it
 * and the cross-axis offset is within {@link EDGE_CONSTANTS.COLLINEAR_TOLERANCE}.
 * `null` when they are offset enough to need a mid-axis jog, or when the faces
 * exit on different axes (an L-shape, which never needs one). */