Line2NodeMaterial: Remove unused lineWidth property.

[Jenychen1996]

Fixed #31398

Description

In the global environment of three.js, the lineWidth in Line2NodeMaterial does not take effect and is essentially ineffective. To modify the line width, it is necessary to use the linewidth setting. Additionally, neither Material nor NodeMaterial contains a linewidth property. Therefore, the lineWidth property in Line2NodeMaterial should be changed to linewidth, and its default value should be set to 1.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.27 78.93	338.27 78.93	+0 B +0 B
WebGPU	558.54 154.59	558.52 154.58	-17 B -5 B
WebGPU Nodes	557.46 154.37	557.45 154.37	-17 B -5 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	469.62 113.66	469.62 113.66	+0 B +0 B
WebGPU	634.18 171.62	634.18 171.62	+0 B +0 B
WebGPU Nodes	589.31 160.95	589.31 160.95	+0 B +0 B

[Jenychen1996]

Sry. I am unable to fix the ESLint check errors. When I try to modify WebGLRenderer.js, I am prompted that the current file cannot be edited.

[WestLangley]

Don't worry. The linting errors in WebGLRenderer.js have been fixed. You can try merging from dev again.

[Mugen87]

Additionally, neither Material nor NodeMaterial contains a linewidth property.

The property is defined by the this.setDefaultValues( _defaultValues ); call in the constructor. So the property technically exists and does not have to be defined again.

Granted, this isn't ideal for documentation since Line2NodeMaterial derives from NodeMaterial and not a line material. However, for the time being, let's continue using the policy. So you can just remove lineWidth and that's it.