title: Qt: Ambiguous shortcut issue
body: <p>I've implemented a dialog with two customized text-editor inside(Two editor objects with same class)
  This custom widget is an inherited class from QWidget and it has two widgets inside, one is a actions-tool-bar and second is a QTextEdit. I set some shortcuts to this custom widget for some actions like 'Make text Bold', 'Make text Italic', so on.</p>
  
  <p>here is a picture of these widgets inside of my dialog:</p>
  
  <p><img src="https://i.stack.imgur.com/en3mw.png" alt="Two custom Text-Edit inside a dialog">
  <br></p>
  
  <p>So far every thing is ok.
  But, when I press Ctrl+B for example, I got this error message: </p>
  
  <pre><code>QAction::eventFilter: Ambiguous shortcut overload: Ctrl+B
  </code></pre>
  
  <p>setting the shortcut context to WidgetWithChildrenShortcut won't help me to disambiguate shortcuts.</p>
  
  <p>anyone has any other idea?  </p>