Previewing source generated file stops the source generator from applying changes

[mrgleba]

Type: Bug

Issue Description

When working with source generators (any will do - the included
Regex or Json as well) the extension quickly picks up changes and reacts accordingly.
But as soon as the resulting souce generated file is previewed the subsequent changes are not recognised.

Steps to Reproduce

    public class WeatherForecast
    {
        public DateTime Date { get; set; }
    }

    [JsonSourceGenerationOptions(WriteIndented = true)]
    [JsonSerializable(typeof(WeatherForecast))]
    internal partial class SourceGenerationContext : JsonSerializerContext
    {
    }    

You can change the property name "Date" and the extensions applies the changes and shows "3 references" above the property.

When you navigate to the source generated file and then try to change the property name the change is not recognised (0 references is shown)

Expected Behavior

Actual Behavior

Logs

C# log

Post the output from Output-->C# here

C# LSP Trace Logs

Post the output from Output-->C# LSP Trace Logs here. Requires the `C#` output window log level to be set to `Trace`

Environment information

VSCode version: 1.95.3
C# Extension: 2.55.29
Using OmniSharp: false

Dotnet Information

.NET SDK: Version: 9.0.100 Commit: 59db016f11 Workload version: 9.0.100-manifests.3068a692 MSBuild version: 17.12.7+5b8665660

Runtime Environment:
OS Name: ubuntu
OS Version: 24.10
OS Platform: Linux
RID: linux-x64
Base Path: /usr/share/dotnet/sdk/9.0.100/

.NET workloads installed:
There are no installed workloads to display.
Configured to use loose manifests when installing new manifests.

Host:
Version: 9.0.0
Architecture: x64
Commit: 9d5a6a9aa4

.NET SDKs installed:
8.0.404 [/usr/share/dotnet/sdk]
9.0.100 [/usr/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.11 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.0 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.11 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.0 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
DOTNET_ROOT [/usr/share/dotnet]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
copilot	GitHub	1.246.0	github.copilot-1.246.0
copilot-chat	GitHub	0.22.4	github.copilot-chat-0.22.4
csharp	ms-dotnettools	2.55.29	ms-dotnettools.csharp-2.55.29-linux-x64
gitlens	eamodio	16.0.4	eamodio.gitlens-16.0.4
hexeditor	ms-vscode	1.11.1	ms-vscode.hexeditor-1.11.1
vscode-dotnet-runtime	ms-dotnettools	2.2.3	ms-dotnettools.vscode-dotnet-runtime-2.2.3
vscode-language-pack-pl	MS-CEINTL	1.95.2024103009	ms-ceintl.vscode-language-pack-pl-1.95.2024103009
vscode-pull-request-github	GitHub	0.100.3	github.vscode-pull-request-github-0.100.3

Extension version: 2.55.29
VS Code version: Code 1.95.3 (f1a4fb101478ce6ec82fe9627c43efbf9e98c813, 2024-11-13T14:50:04.152Z)
OS version: Windows_NT x64 10.0.26100
Modes:
Remote OS version: Linux x64 5.14.0-284.30.1.el9_2.x86_64

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-8705G CPU @ 3.10GHz (8 x 3096)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	15.82GB (6.44GB free)
Process Argv	--folder-uri vscode-remote://ssh-remote%2B7b22686f73744e616d65223a2235312e37352e33362e3331222c2275736572223a226d7a6965222c22706f7274223a323032337d/home/mzie/Weles3 --crash-reporter-id 16d60f3a-8ad4-4d6d-8252-d56b783c217f
Screen Reader	no
VM	0%

Item	Value
Remote	SSH: 51.75.36.31:2023
OS	Linux x64 5.14.0-284.30.1.el9_2.x86_64
CPUs	AMD EPYC 7413 24-Core Processor (48 x 1917)
Memory (System)	125.74GB (94.48GB free)
VM	0%

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azure-dev_surveyone:30548225
a9j8j154:30646983
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pythonnoceb:30805159
pythonmypyd1:30879173
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pythontbext0:30879054
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
dvdeprecation:31068756
dwnewjupytercf:31046870
nativerepl2:31139839
pythonrstrctxt:31112756
nativeloc1:31192215
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iacca1:31171482
notype1cf:31157160
5fd0e150:31155592
dwcopilot:31170013
stablechunks:31184530