title: Python, unstable behavior of addcopyfighandler
body: <p>I found the following strange (unstable) behavior of the Python addcopyfighandler package. I use the same code in two computers, #1 and #2</p>
  <pre><code>import matplotlib.pyplot as plt
  import numpy as np
  import addcopyfighandler
  t = np.arange(0.0, 2.0, 0.01)
  s = 1 + np.sin(2 * np.pi * t)
  fig, ax = plt.subplots()
  ax.plot(t, s)
  ax.set(xlabel='time (s)', ylabel='voltage (mV)',
         title='About as simple as it gets, folks')
  ax.grid()
  fig.savefig(&quot;test.png&quot;)
  plt.show()
  </code></pre>
  <p>In #1 computer, I addcopyfighandler works as expectedly fine, with the use of ctrl+C, I can copy and then paste the plot to the paint program. But in #2 computer, after ctrl+C, the clipboard is empty, so after pasting (ctrl+V), the paint program is empty. Only the one difference I have found visually, in #1 computer the matplotlib-navigationtoolbar of plt figure is in the top, but in #2 the matplotlib-navigationtoolbar of plt is in the bottom, see image. I use Python 3.10 (Win-10). How to overcome this issue and copy the figure by ctrl+C for all cases? I use Python 3.10 (Win-10). Thanks.
  <a href="https://i.stack.imgur.com/NGOxT.png" rel="nofollow noreferrer">enter image description here</a></p>