src/vs/editor/browser/widget/codeEditorWidget.ts/CodeEditorWidget/showDropIndicatorAt
class CodeEditorWidget:	private showDropIndicatorAt(position: Position): void {
		let newDecorations: IModelDeltaDecoration[] = [{
			range: new Range(position.lineNumber, position.column, position.lineNumber, position.column),
			options: CodeEditorWidget.dropIntoEditorDecorationOptions
		}];

		this._dropIntoEditorDecorationIds = this.deltaDecorations(this._dropIntoEditorDecorationIds, newDecorations);
		this.revealPosition(position, editorCommon.ScrollType.Immediate);
	}