title: QtWebBrowser macOS Signing Issue
body: <p>I have recently run into a strange issue related to the QtWebBrowser on macOS. The QtWebEngine control doesnt seem to be loading outside of my development machine. I have tracked it to the signing. If I build the application and do not sign it, I can run it fine on another machine. As soon as I sign the application, the QtWebEngine control stops loading on other machines. It got even weirder when I went back to test an older version and it did the same thing. It is a version that I built and tested previously and was definitely working. Im fairly certain the computer I am testing with wasn't updated since then.</p>
  
  <p>Something that seems like it might be a clue is a warning that is showing up now. I dont remember seeing it before.</p>
  
  <pre><code>2019-04-28 22:11:30.247507-0700 QtWebEngineProcess[30607:140529] [User Defaults] Couldn't read values in CFPrefsPlistSource&lt;0x106f08560&gt; (Domain: com.apple.universalaccess, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: Yes): accessing preferences outside an application's container requires user-preference-read or file-read-data sandbox access
  </code></pre>
  
  <p>Here is the command I am using to sign the application.</p>
  
  <pre><code>sudo codesign --deep --force --verify --verbose --sign "Developer ID Application: ***" --options runtime Output/MyApp.app
  </code></pre>