message: clear overpaint upon behavior removal
diff: @@ -245,10 +245,10 @@ export namespace ColorRepresentation3D {
  if (parsed.length === 0) throw new Error('No query');
  const query = transpileMolScript(parsed[0]);
  - return this.apply([{ query, color: params.color }])
  + return this.applyMappings([{ query, color: params.color }])
  }
  - private apply(colorMappings: ColorMappings): boolean {
  + private applyMappings(colorMappings: ColorMappings): boolean {
  if (!this.updateData() && ColorMappings.areEqual(colorMappings, this.currentColorMappings)) return false;
  this.currentColorMappings = colorMappings;
  if (!this.repr.data || !this.structure.data) return true;
  @@ -266,16 +266,19 @@ export namespace ColorRepresentation3D {
  const loci = StructureSelection.toLoci2(result)
  layers.push({ loci, color, alpha: 1 })
  }
  - this.repr.data.setOverpaint(layers)
  + return this.applyLayers(layers)
  + }
  + private applyLayers(layers: Overpaint.Layers): boolean {
  + if (!this.repr.data) return true;
  + this.repr.data.setOverpaint(layers)
  this.ctx.canvas3d.add(this.repr.data);
  this.ctx.canvas3d.requestDraw(true);
  -
  return true;
  }
  unregister(): void {
  - this.apply([])
  + this.applyLayers([{ loci: EveryLoci, color: ColorNames.black, alpha: 0 }]) // clear
  this.repr.cell = void 0;
  this.structure.cell = void 0;
  }
  