title: VSCode C# missing suggestions documentation tooltip while typing
body: <p>I'm missing the suggestions documentation tooltip while doing C# in VSCode and having the C# Omnisharp extension installed. 
  What is this tooltip called? How can I turn this on?</p>
  
  <p>Current behavior: <a href="https://i.stack.imgur.com/kD9E1.png" rel="nofollow noreferrer">https://i.stack.imgur.com/kD9E1.png</a></p>
  
  <p>Wanted behaviour:<a href="https://i.stack.imgur.com/qdWYT.jpg" rel="nofollow noreferrer">https://i.stack.imgur.com/qdWYT.jpg</a></p>
  
  <p>Note that I can see documentation, but only when I hover my mouse over it. Not while I'm typing: <a href="https://i.stack.imgur.com/PS1ft.png" rel="nofollow noreferrer">https://i.stack.imgur.com/PS1ft.png</a></p>
  
  <pre><code>C:\&gt;code --list-extensions
  77qingliu.sas-syntax
  alexiv.vscode-angular2-files
  Angular.ng-template
  casualjim.theme-desertex
  christian-kohler.path-intellisense
  CoenraadS.bracket-pair-colorizer
  Darfka.vbscript
  eg2.tslint
  esbenp.prettier-vscode
  formulahendry.auto-rename-tag
  infinity1207.angular2-switcher
  ionceflorin.copy-current-file-path
  jchannon.csharpextensions
  jmrog.vscode-nuget-package-manager
  johnpapa.Angular2
  ms-vscode.csharp
  msjsdiag.debugger-for-chrome
  PKief.material-icon-theme
  redhat.java
  Shan.code-settings-sync
  sohibe.java-generate-setters-getters
  vscjava.vscode-java-debug
  vscjava.vscode-java-pack
  vscjava.vscode-java-test
  vscjava.vscode-maven
  vscodevim.vim
  </code></pre>