src/vs/workbench/contrib/customEditor/browser/customEditorInput.ts/CustomEditorInput/matches
class CustomEditorInput:	public override matches(other: IEditorInput | IUntypedEditorInput): boolean {
		if (super.matches(other)) {
			return true;
		}
		return this === other || (other instanceof CustomEditorInput
			&& this.viewType === other.viewType
			&& isEqual(this.resource, other.resource));
	}