Miscoloration caused by '?' at end of comment

[mikeduffy]

Issue Type: Bug

With extensions disabled, place the following three lines in a .ts file:

  const a = 2 // tunable?
  console.log(`${a}`)
  const b = 3

The third line will be miscolored by VS Code. Adding a blank line after the first will correct the issue, as will removing the ${...} from the template string.

Here's an image of the problem: https://imgur.com/a/6wLJJv9

VS Code version: Code 1.26.0 (4e93618, 2018-08-13T16:20:44.170Z)
OS version: Darwin x64 17.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz (8 x 2900)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	4, 3, 3
Memory (System)	16.00GB (0.50GB free)
Process Argv	/Applications/Visual Studio Code.app/Contents/MacOS/Electron -psn_0_8259552
Screen Reader	no
VM	0%

Extensions (5)

Extension	Author (truncated)	Version
vscode-eslint	dba	1.4.12
tslint	eg2	1.0.34
cpptools	ms-	0.17.7
csharp	ms-	1.15.2
vscode-proto3	zxh	0.2.1

[mjbvz]

Duplicate of microsoft/TypeScript-TmLanguage#646