title: QtCreator: appearance of included subprojects (.pri)
body: <p>I have two projects in QtCreator, which both include two .pri files in another directory:</p>
  
  <pre><code>[common]
      * common.pri
      * database.pri
      * ...
  [projects]
      [project1]
          * project1.pro
          * ...
      [project2]
          * project2.pro
          * ...
  </code></pre>
  
  <p>Let's concentrate on one .pro file. It contains the two includes:</p>
  
  <pre><code>COMMONPATH = ../../common
  
  # INCLUDE COMMON FILES
  !include($${COMMONPATH}/common.pri) {
      error(Failed to include common/common.pri)
  }
  
  # INCLUDE DATABASE FILES
  !include($${COMMONPATH}/database.pri) {
      error(Failed to include common/database.pri)
  }
  </code></pre>
  
  <p>After saving my .pro file, QtCreator didn't notice the two .pri files in the project manager.</p>
  
  <p>After some time (and I can't remember what I did to do so) <strong>QtCreator showed one of the two .pri files</strong> as shown in the screenshot:</p>
  
  <p><img src="https://i.stack.imgur.com/yQdE1.png" alt="Project Manager"></p>
  
  <p>I'm now stuck since I can't tell <strong>why QtCreator doesn't show the second .pri file</strong> the same way it shows the first one, neither why it showed the first one only after some time...</p>
  
  <p>I tried to replace the $${COMMONPATH} variable by its value, removed the error handling, restarted QtCreator multiple times, run qmake from the menu multiple times, ...</p>