Does not detect files that are already added to the CSProject

[prostolyubo]

I get the popup saying that file xyz.cs is not added to the csproj while it is.
Looking at changes in the csproj file it seems that it adds items to the last item group. Is it possible that when looking at the added files it is not checking all the item groups?

Here's an example of item added by the extension:

  <ItemGroup>
    <ProjectCapability Remove="LaunchProfiles" />
    <ProjectCapability Remove="SharedProjectReferences" />
    <ProjectCapability Remove="ReferenceManagerSharedProjects" />
    <ProjectCapability Remove="ReferenceManagerProjects" />
    <ProjectCapability Remove="COMReferences" />
    <ProjectCapability Remove="ReferenceManagerCOM" />
    <ProjectCapability Remove="AssemblyReferences" />
    <ProjectCapability Remove="ReferenceManagerAssemblies" />
    <Compile Include="Assets\Scripts\ICellProcessor.cs" />
  </ItemGroup>
</Project>

here is an example of files that the extension claims are not part of the solution, despite being in the csproj file:

 <ItemGroup>
    <Analyzer Include="/Users/heti/.vscode/extensions/visualstudiotoolsforunity.vstuc-1.2.1/Analyzers/Microsoft.Unity.Analyzers.dll" />
    <Analyzer Include="/Applications/Unity/Hub/Editor/6000.3.7f1/Unity.app/Contents/Resources/BuildPipeline/Unity.SourceGenerators/Unity.SourceGenerators.dll" />
    <Analyzer Include="/Applications/Unity/Hub/Editor/6000.3.7f1/Unity.app/Contents/Resources/BuildPipeline/Unity.SourceGenerators/Unity.Properties.SourceGenerator.dll" />
    <Analyzer Include="/Applications/Unity/Hub/Editor/6000.3.7f1/Unity.app/Contents/Resources/BuildPipeline/Unity.SourceGenerators/Unity.UIToolkit.SourceGenerator.dll" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="Assets/Scripts/Cell.cs" />
    <Compile Include="Assets/Scripts/BoardManager.cs" />
  </ItemGroup>
  <ItemGroup>
    <Reference Include="UnityEngine">
      <HintPath>/Applications/Unity/Hub/Editor/6000.3.7f1/Unity.app/Contents/Resources/Scripting/Managed/UnityEngine/UnityEngine.dll</HintPath>
      <Private>False</Private>
    </Reference>

[ongyx]

Windows-style path separators (\) are hardcoded into Semitone, so hasItem will report that the path isn't there on non-Windows platforms. I'll change the default behavior to use the OS path separator and compare paths with different separators equally for compatibility.

For ItemGroups, addItem looks for the last item group with the given item type (Compile, Content, etc.), resorting to creating a new item group if none were found.

[ongyx]

Please try version 0.1.2. Thank you!