ClipEdges.dispose() destroys SHARED style materials when Clipper.localClippingPlanes is false (the default) — one disposed clip breaks all others

[stokuewe]

Versions

@thatopen/components-front 3.4.4 with @thatopen/components 3.4.8 (verified against the published dists).

What happens

ClipEdges.getStyleMeshes() clones the style materials ONLY in local-clipping mode:

const local = this._components.get(Clipper).localClippingPlanes,
      line  = local && lineMat ? lineMat.clone() : lineMat,
      fill  = local && fillMat ? fillMat.clone() : fillMat;

With the default Clipper.localClippingPlanes = false, the meshes mount the original materials from ClipStyler.styles. ClipEdges.dispose() then runs:

this._components.get(Disposer).destroy(this.three, true, true);

and Disposer.destroy recursively calls .dispose() on every child's material.

Consequence

Disposing ONE ClipEdges instance disposes the line and fill materials that every OTHER ClipEdges sharing the same style still uses — their sections render broken from that moment on. Any app that creates and removes styled section planes at runtime with a shared style hits this on the first removal.

Repro (library only)

1. const style = clipStyler.styles.create("s", { lineMaterial, fillMaterial }) (shared style).
2. Create two styled clips from two planes with that style.
3. Dispose one of them.
4. The remaining clip's edges/fill render with disposed materials.

Suggested fix

Clone the materials per ClipEdges regardless of clipping mode, or skip material disposal for style-owned materials in dispose().