title: Python Plotly xaxis hover text disappears when hoverinfo is set in a trace
body: <p>I am plotting multiple (2) lines from a timeseries with plotly (v 2.7) in Jupyter notebook. I would like that, on hover, the axis label to appear, and a formatted text for one of the lines.</p>
  
  <p>First, I had</p>
  
  <pre><code>data = []
  
  name = 'houses'
  data.append(
      go.Scatter(
          x=df.index,
          y=df[name],
          name=name,
      )
  )
  
  name = 'vazamento'
  scale = 50
  data.append(
      go.Scatter(
          x=df.index,
          y=df[name]*scale,
          name='leaks' + ' (ratio {0}:1)'.format(scale),
      )
  )
  
  fig = go.Figure(data=data)
  iplot(fig)
  </code></pre>
  
  <p>which gave me <a href="https://i.stack.imgur.com/czrjL.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/czrjL.jpg" alt="enter image description here"></a></p>
  
  <p>Now, trying to show text on hover:</p>
  
  <pre><code>name = 'vazamento'
  scale = 50
  data.append(
      go.Scatter(
          x=df.index,
          y=df[name]*scale,
          name='leaks' + ' (ratio {0}:1)'.format(scale),
          # Added the two lines below
          text=df[name].apply(lambda x: "{0:.0f}".format(x)+" - ")+str('leaks'),
          hoverinfo='text',
      )
  )
  </code></pre>
  
  <p>which results in the chart below, making the x axis info on hover disappear.
  <a href="https://i.stack.imgur.com/7YmWu.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7YmWu.jpg" alt="enter image description here"></a></p>
  
  <p>I have tried editing the xaxis in the chart layout attribute, but had no success.</p>
  
  <p>How can I keep showing the X axis info on hover, just like it appears in the first chart?</p>