title: Figure title (suptitle()) disappears if you specify figure size in Matplotlib
body: <p>Take, for instance, this code sample:</p>
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  f = np.random.random(100)
  g = np.random.random(100)
  fig = plt.figure(figsize=(15,15))
  fig.suptitle('Long Suptitle', fontsize=24)
  plt.subplot(121)
  plt.plot(f)
  plt.title('Very Long Title 1', fontsize=20)
  plt.subplot(122)
  plt.plot(g)
  plt.title('Very Long Title 2', fontsize=20)
  plt.subplots_adjust(top=0.85)
  plt.show()
  </code></pre>
  
  <p>Running it shows two subplots with individual titles, but the overall figure title "Long Suptitle" is not visible.</p>
  
  <p>However, if you remove <code>figsize=(15,15)</code>, then the overall figure title becomes visible again.</p>
  
  <p><strong>Is it possible to keep the <code>suptitle()</code> text visible while modifying the size of the figure?</strong></p>