src/vs/editor/common/viewModel/viewModelImpl.ts/ViewModel/_invalidateDecorationsColorCache
class ViewModel:	private _invalidateDecorationsColorCache(): void {
		const decorations = this.model.getOverviewRulerDecorations();
		for (const decoration of decorations) {
			const opts1 = <ModelDecorationOverviewRulerOptions>decoration.options.overviewRuler;
			if (opts1) {
				opts1.invalidateCachedColor();
			}
			const opts2 = <ModelDecorationMinimapOptions>decoration.options.minimap;
			if (opts2) {
				opts2.invalidateCachedColor();
			}
		}
	}