title: vscode omnisharp not working for solution but works for project
body: <p>I have folders structured like this: project/csproj A, project/csproj B
  If I open in vs code project dir, omnisharp works for csproj B only. If I open in vs code project/csproj A directory, omnisharp works for this project.</p>
  
  <p>How fix that so I can open project directory and have working omnisharp for both projects?</p>
  
  <p>Broken project is nunit type if that matters. I tried reloading vscode, disabling/enabling omnisharp.
  I created project in empty directory with </p>
  
  <pre><code>dotnet new nunit -n=projectB
  </code></pre>