Syntax highlighting/colors for records does not work.

Issue Description

Syntax highlighting/colors for records does not work.

Steps to Reproduce

Create a dotnet 5 project. create a record, such as the below, I have included several positions/orders of records in the code, as well as one class for comparison

Expected Behavior

Coloration for record much like for class or struct, etc…

Actual Behavior

The output depends on the order, see how FooRecord3 moves and changes the output color.

vs. vs.

The presence of { } curly braces seems to be the cause of the change. However, even with a curly braced record placed at the top, the highlighting is still inconsistent. Notice how public is colored in the record definition of FooRecord3 but not in the constructor as in FooClass nor is the keyword record displayed consistently in the 3 records included.

For a quick reproduction, here is the sample source

    public record FooRecord2(
        string param1,
        double param2,
        float param3,
        int param4,
        FooRecord param5,
        FooClass param6
    ) {
        public string SomeProperty { get; set; }
    }
    public record FooRecord(
        string param1,
        double param2,
        float param3,
        int param4,
        FooRecord param5,
        FooClass param6
    );

    public record FooRecord3 {
        public FooRecord3(
                string param1,
                double param2,
                float param3,
                int param4,
                FooRecord param5,
                FooClass param6
        ) {
            //nothing
        }
        public string SomeProperty { get; set; }
    }


    public class FooClass {
        public string SomeProperty { get; set; }

        public FooClass(
            string param1,
            double param2,
            float param3,
            int param4,
            FooRecord param5,
            FooClass param6
        ) {
            //empty
        }
    }

Note after pasting the source into this ticket, I notice that GitHub has syntax coloring issues as well with records.

OmniSharp log

Starting OmniSharp server at 11/17/2020, 5:19:31 AM
    Target: c:\Users\eric\dev\src\github.com\erichiller\mkmrk\mkmrk.sln

OmniSharp server started.
    Path: c:\Users\eric\.vscode\extensions\ms-dotnettools.csharp-1.23.6\.omnisharp\1.37.3\OmniSharp.exe
    PID: 13360

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on Windows 6.2.9200.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 1 MSBuild instance(s)
            1: StandAlone 16.8.0 - "c:\Users\eric\.vscode\extensions\ms-dotnettools.csharp-1.23.6\.omnisharp\1.37.3\.msbuild\Current\Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        MSBUILD_EXE_PATH environment variable set to 'c:\Users\eric\.vscode\extensions\ms-dotnettools.csharp-1.23.6\.omnisharp\1.37.3\.msbuild\Current\Bin\MSBuild.exe'
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: StandAlone 16.8.0 - "c:\Users\eric\.vscode\extensions\ms-dotnettools.csharp-1.23.6\.omnisharp\1.37.3\.msbuild\Current\Bin"
            CscToolExe = csc.exe
            CscToolPath = c:\Users\eric\.vscode\extensions\ms-dotnettools.csharp-1.23.6\.omnisharp\1.37.3\.msbuild\Current\Bin\Roslyn
            MSBuildExtensionsPath = c:\Users\eric\.vscode\extensions\ms-dotnettools.csharp-1.23.6\.omnisharp\1.37.3\.msbuild
            MSBuildToolsPath = c:\Users\eric\.vscode\extensions\ms-dotnettools.csharp-1.23.6\.omnisharp\1.37.3\.msbuild\Current\Bin
[info]: OmniSharp.Cake.CakeProjectSystem

C# log

none

Environment information

VSCode version: 1.51.1 C# Extension: 1.23.6

Dotnet Information

.NET SDK (reflecting any global.json): Version: 5.0.100 Commit: 5044b93829

Runtime Environment: OS Name: Windows OS Version: 10.0.19042 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\5.0.100\

Host (useful for support): Version: 5.0.0 Commit: cf258a14b7

.NET SDKs installed: 3.1.102 [C:\Program Files\dotnet\sdk] 3.1.302 [C:\Program Files\dotnet\sdk] 3.1.401 [C:\Program Files\dotnet\sdk] 5.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs: https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
better-align	wwm	1.1.6
cpptools	ms-vscode	1.1.1
csharp	ms-dotnettools	1.23.6
docomment	k–kato	0.1.19
erlang-otp	yuce	0.2.4
errorlens	usernamehw	3.2.4
githistory	donjayamanne	0.6.14
gitignore	codezombiech	0.6.0
graphql-for-vscode	kumar-harsh	1.15.3
hexeditor	ms-vscode	1.3.0
jsdoc-markdown-highlighting	bierner	0.0.1
markdown-all-in-one	yzhang	3.4.0
msbuild-project-tools	tintoy	0.3.10
path-intellisense	christian-kohler	2.3.0
powershell-preview	ms-vscode	2020.9.0
rainbow-csv	mechatroner	1.7.1
remote-ssh-edit	ms-vscode-remote	0.56.0
remote-wsl	ms-vscode-remote	0.51.3
selected-lines-count	gurumukhi	1.4.0
sqltools	mtxr	0.23.0
svg	jock	1.4.1
template-string-converter	meganrogge	0.3.0
theme-karyfoundation-themes	karyfoundation	20.0.3
todo-tree	Gruntfuggly	0.0.188
toml	be5invis	0.5.1
unique-lines	bibhasdn	1.0.0
vscode-docker	ms-azuretools	1.8.0
vscode-eslint	dbaeumer	2.1.13
vscode-great-icons	emmanuelbeziat	2.1.60
vscode-json5	mrmlnc	1.0.0
vscode-scss	mrmlnc	0.9.0
vscode-scss-formatter	sibiraj-s	2.0.2
vscode-solution-explorer	fernandoescolar	0.3.11
vscode-yaml	redhat	0.12.0
xml	DotJoshJohnson	2.5.1

[filipw]

you should enable semantic highlighting

"csharp.semanticHighlighting.enabled": true,
"editor.semanticHighlighting.enabled": true

[sweco-benebw]

I still experience this issue with the extension version 1.23.8.

When I want to inspect editor scopes O# logs the following error:

{ “Request_seq”: 945, “Command”: “/v2/highlight”, “Running”: true, “Success”: false, “Message”: “"System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.\r\n at System.ThrowHelper.ThrowKeyNotFoundException()\r\n at System.Collections.Generic.Dictionary2.get_Item(TKey key)\\r\\n at OmniSharp.Roslyn.CSharp.Services.SemanticHighlight.SemanticHighlightService.CreateSemanticSpan(IEnumerable1 results, TextLineCollection lines) in D:\\a\\1\\s\\src\\OmniSharp.Roslyn.CSharp\\Services\\SemanticHighlight\\SemanticHighlightService.cs:line 72\r\n at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext()\\r\\n at System.Linq.Buffer1…ctor(IEnumerable1 source)\\r\\n at System.Linq.Enumerable.ToArray[TSource](IEnumerable1 source)\r\n at OmniSharp.Roslyn.CSharp.Services.SemanticHighlight.SemanticHighlightService.<Handle>d__1.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Roslyn.CSharp\\Services\\SemanticHighlight\\SemanticHighlightService.cs:line 53\r\n— End of stack trace from previous location where exception was thrown —\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at OmniSharp.Endpoint.EndpointHandler2.<GetFirstNotEmptyResponseFromHandlers>d__19.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n at OmniSharp.Endpoint.EndpointHandler2.<HandleRequestForLanguage>d__20.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Host\\Endpoint\\EndpointHandler.cs:line 230\r\n— End of stack trace from previous location where exception was thrown —\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at OmniSharp.Endpoint.EndpointHandler`2.<Process>d__16.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Host\\Endpoint\\EndpointHandler.cs:line 131\r\n— End of stack trace from previous location where exception was thrown —\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at OmniSharp.Stdio.Host.<HandleRequest>d__13.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Stdio\\Host.cs:line 215"”, “Body”: null, “Seq”: 17467, “Type”: “response” }