collapse not work for multiple lines string variable

[taina0407]

Issue Type

Bug

Description

Try to collapse functionA as bellow doesn't work, only collapse till the begin "`" character. Expected to collapse all function.

const functionA = (options) => {
  const {variable, } = options;
  const config = `
#EXAMPLE CONFIG FILE

#EXAMPLE VARIABLE
VARIABLE=${variable}
`;
};

VS Code Info

VS Code version: Code 1.20.1 (f88bbf9, 2018-02-13T15:23:28.607Z)
OS version: Darwin x64 16.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz (8 x 4201)
Load (avg)	2, 2, 2
Memory (System)	16.00GB (0.33GB free)
Process Argv	/Applications/Visual Studio Code.app/Contents/MacOS/Electron
Screen Reader	no
VM	0%

Extensions (7)

Extension	Author (truncated)	Version
vscode-docker	Pet	0.0.25
vscode-eslint	dba	1.4.7
gitlens	eam	8.0.2
php-intellisense	fel	2.2.9
vscode-esformatter	how	1.5.2
azure-account	ms-	0.3.1
bash-beautify	sha	0.1.1

Reproduces without extensions

[aeschli]

Our folding is currently based on indentation only.
The request to add language aware folding capabilities is #3422