title: Bokeh: The widths of vertical bars doesn't change
body: <p>I came across one problem I couldn't find a solution. I would like to change the bar width of my plot, but doesn't matter the number I put in the WIDTH parameter of the method vbar, the graph remains the same. </p>
  
  <p><a href="https://i.stack.imgur.com/PlU5S.png" rel="nofollow noreferrer">The plot with WIDTH=100</a></p>
  
  <p><a href="https://i.stack.imgur.com/PlU5S.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PlU5S.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/Lildu.png" rel="nofollow noreferrer">The plot with WIDTH=500</a></p>
  
  <p><a href="https://i.stack.imgur.com/Lildu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lildu.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/6Otvu.png" rel="nofollow noreferrer">Apply Zoom is not a solution. The bar seems like a line</a></p>
  
  <p><a href="https://i.stack.imgur.com/6Otvu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6Otvu.png" alt="enter image description here"></a></p>
  
  <p>Here is the code:</p>
  
  <pre><code>from bokeh.io import show, output_file
  from bokeh.plotting import figure
  import pandas as pd
  
  df = pd.read_csv('Data/moviments.txt', delimiter='\t', encoding='utf-8')
  
  output_file("bar_basic.html")
  
  df['DT']=pd.to_datetime(df['DT'])
  
  p = figure(x_axis_type='datetime',
             plot_width=1230,
             plot_height=500,
             title='Moviments')
  
  p.vbar(x=df['DT'],top=df['SUM_IN'], width=100, fill_alpha=0.8, color='green')
  p.vbar(x=df['DT'],top=df['SUM_OUT'], width=100, fill_alpha=0.8, color='red')
  
  p.xgrid.grid_line_color = None
  
  show(p)
  </code></pre>
  
  <p>That is the info of my dataframe:</p>
  
  <blockquote>
    <p> RangeIndex: 133 entries, 0 to
    132 Data columns (total 5 columns): DT                133 non-null
    datetime64[ns] TRANSACT_IN       133 non-null int64 TRANSACT_OUT<br>
    133 non-null int64 SUM_IN            133 non-null int64 SUM_OUT<br>
    133 non-null int64 dtypes: datetime64ns, int64(4)</p>
  </blockquote>