title: Add Package explorer in RCP-Application result in loosing some icon
body: <p>In my eclispe rcp application I added a package explorer adding org.eclipse.jdt.ui</p>
  
  <p><img src="https://i.stack.imgur.com/nRmGt.jpg" alt="enter image description here"></p>
  
  <p>When I use my rcp-app, as I create a new Project by "New Project Wizard" to add a "General Project", the project is  correctely created, but the corresponding icon in package explorer view is not loaded.</p>
  
  <p>What is the plugin I have to add to my application to see that all the (platform) Icons correctly ?</p>
  
  <p>Thanks a lot</p>