Wrapping text field wants to be 1 line high despite constraints
<p>Here's what I do (in Xcode 7.3):</p>

<ul>
<li>Make a new view xib file</li>
<li>Drag a "wrapping text field" into the view</li>
<li>Resize it to be the standard 20 pixels away from each side of the parent view</li>
<li>Open the pinning tool ("Add new constraints") and click all four red I-beam shapes to add a constraint for each side</li>
<li>Click on "Add 4 Constraints"</li>
</ul>

<p>The text field ends up outlined in orange, with a dotted orange rectangle showing it wants to be 1 line (22 pixels) high.</p>

<p>Clicking "Update constraints" does nothing. Clicking "Update frames" shrinks it down to 22 pixels high, but it's still orange because of course now it violates its top margin constraint.</p>

<p>Why does it want to be that height? The point of choosing a "wrapping text field" is I want it to be more than one line high.</p>