title: Make Scaffold create a Drawer but not create the drawer related icon button in the app-bar
body: <p>My app uses a <code>Drawer</code> to present an item properties inspector by means of <code>endDrawer:</code>.</p>
  <p>The <code>Drawer</code> appears, then an item gets clicked. It disappears, when the properties inspector performs its save operation.</p>
  <p>Thus, there is no need to make the <code>Drawer</code> come in using a click on the drawer icon button in the app-bar.</p>
  <p>If endDrawer is set, navigation arrow does not appear, but space gets consumed:</p>
  <p><a href="https://i.stack.imgur.com/AnsQv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AnsQv.png" alt="enter image description here" /></a></p>
  <p>If endDrawer isn't set, back arrow gets its space:</p>
  <p><a href="https://i.stack.imgur.com/nlp3m.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nlp3m.png" alt="enter image description here" /></a></p>
  <p><strong>How to tell <code>Scaffold</code> prepare a <code>Drawer</code> passed via <code>drawer:</code> or <code>endDrawer:</code>, but not insert the related icon button in the app-bar?</strong></p>