title: Controlling figure height when using interactive plots in jupyter lab
body: <p>I'm trying to use a combination of JupyterLab and the latest ipywidgets to have a basic graphic interface to explore some data. However, I cannot find a way to set up the figure height for the interactive plot</p>
  
  <p>The notebook loads some file, then the user has the ability to pass some input using widgets (in the code below a text box). Finally, by pressing a button the graph is generated and passed to an Output widget.</p>
  
  <p>This is the example code:</p>
  
  <pre><code>
  import pandas as pd
  import matplotlib.pyplot as plt
  from IPython.display import clear_output, display
  import ipywidgets as widgets
  
  data = pd.read_csv('data.csv')
  
  def show_results(input):
      if 'fig' in locals():
          del fig
  
      with out:
          clear_output(True)
          fig, ax = plt.subplots(1, 1)
          ax.axis('equal')
          data.loc[input.value].plot(cmap='inferno_r', column='probability', ax=ax, legend=True)
          plt.show()
  
  
  input = widgets.Text(placeholder='input field', description='Input:')
  
  showMe = widgets.Button(
      description='Show me the results',
      tooltip='Show me',
  )
  out = widgets.Output(layout = {
              'width': '100%',
              'height': '900px',
              'border': '1px solid black'
          })
  
  
  showMe.on_click(show_results)
  
  display(input)
  display(showMe)
  display(out)
  </code></pre>
  
  <p>The problem is that the graph automatically resizes no matter how large is the Output widget, and no matter of the figsize parameter passed.
  I would expect one of the two to control the output size particularly because there is no more the option to resize the graph manually.</p>
  
  <p>As an additional info the HTML div dealing with the graph inside the Output widget is always 500px height no matter what I do</p>