Inline edge labels on self-loops with opposing sides.

[soerendomroes]

Fixes #659
Fixes #1023

[Copilot]

Pull Request Overview

This PR implements inline edge labels for self-loops that span opposing sides of a node. The changes enable proper routing and placement of edge labels that should be positioned directly on the edge path rather than offset from it.

Key changes:

• Added inline label detection and handling in the orthogonal self-loop router
• Modified bend point calculation to accommodate inline label dimensions
• Updated label placement logic to support inline positioning for opposing-side loops

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
OrthogonalSelfLoopRouter.java	Adds inline label detection, removes edge distance for inline labels, and adjusts bend points to reserve space for inline labels
LabelPlacer.java	Updates label assignment logic to handle inline labels for opposing-side loops and removes inline property for invalid cases
SelfLoopEdge.java	Adds utility methods to check for inline labels and get label sides

Comments suppressed due to low confidence (2)

plugins/org.eclipse.elk.alg.layered/src/org/eclipse/elk/alg/layered/intermediate/loops/routing/OrthogonalSelfLoopRouter.java:381

• The variable name 'labelSides' is misleading as it represents a single PortSide, not multiple sides. Consider renaming to 'labelSide' for clarity.

        PortSide labelSides =  slEdge.getLabelSides();

plugins/org.eclipse.elk.alg.layered/src/org/eclipse/elk/alg/layered/intermediate/loops/SelfLoopEdge.java:98

• The method name 'getLabelSides' suggests it returns multiple sides, but it returns a single PortSide. Consider renaming to 'getLabelSide' for accuracy.

    public PortSide getLabelSides() {