src/vs/editor/browser/widget/codeEditorWidget.ts/CodeEditorWidget/getLineDecorations
class CodeEditorWidget:	public getLineDecorations(lineNumber: number): IModelDecoration[] | null {
		if (!this._modelData) {
			return null;
		}
		return this._modelData.model.getLineDecorations(lineNumber, this._id, filterValidationDecorations(this._configuration.options));
	}