Help, my spinner is too wide!

When dealing with the Spinner widget, especially when using NAVIGATION_MODE_LIST in your Actionbar, you might have stumbled over its weird sizing behavior. Namely, it's much wider than it needs to be. Here's an example of what a spinner in the Actionbar might look like:

The spinner is apparently much wider than it needs to be.

In this post I will explain what the reason for this behavior is, highlight the responsible bit of code from the Android framework and present a method for fixing it.