C# Syntax Highlighting Bug for Tuples & Multilined Variables

[alexr00]

Originally from @AharonSambol in microsoft/vscode#135031

Details

What editor are you seeing the problem in? (e.g. Atom, Visual Studio Code, etc.)
VS Code

What version of the editor are you using?
1.61

What color theme are you using?
N/A as the issue is with the scopes that the tokens are getting.

Repro

Steps to reproduce:
Open a blank C# project and paste the following code:

public class ExClass {

    public static int correctColor; // example for correct color
    public static int 
    value1, value2; // example for incorrect color (should be light blue not white)
}
public class Program {
    void Func(){
        ExClass.value1 = 1; // example for correct color
        (ExClass.value1, ExClass.value2) = (1,2); // example for incorrect color (ExClass should be light blue not white)
    }
}

The type of the variables doesn't matter.

VS Code version: Code 1.61.0 (ee8c7def80afc00dd6e593ef12f37756d8f504ea, 2021-10-07T18:13:09.652Z)
OS version: Windows_NT x64 10.0.19043
Restricted Mode: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-9700KF CPU @ 3.60GHz (8 x 3600)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: enabled_on video_decode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.92GB (9.33GB free)
Process Argv	--crash-reporter-id b5a2ba25-e8a3-43d1-af6e-d42f94d5c410
Screen Reader	no
VM	0%

Extensions (1)

Extension	Author (truncated)	Version
csharp	ms-	1.23.16

A/B Experiments

vsliv368:30146709
vsreu685:30147344
python383cf:30185419
pythonvspyt602:30300191
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30256859
pythonvspyt639:30300192
pythontb:30283811
pythonvspyt551:30345470
pythonptprofiler:30281270
vshan820:30294714
vstes263cf:30335440
vscorecescf:30358481
pythondataviewer:30285071
pythonvsuse255:30340121
vscod805cf:30301675
pythonvspyt200:30340761
binariesv615:30325510
vsccppwtct:30378365
pythonvssor306:30344512
bridge0708:30335490
pygetstartedt2:30371810
dockerwalkthru:30377721
bridge0723:30353136
pythonrunftest32:30373476
pythonf5test824:30373475
javagetstartedc:30364665
pythonvspyt187:30373474
vsqsis400:30381677
vsaa593cf:30376535
vssld246:30379911

[wise0704]

multiple fields: duplicate of #63

tuple deconstruction assignment: related to #77 (comment)