Using {x/y}wheel_zoom tools

[Josucatalina]

Using first ywheel_zoom before xwheel_zoom or wheel_zoom tools in datashaded DynamicMap in Bokeh server ends in error. If any of the other tools is used before ywheel_zoom using it works properly

def timeseries(data):
    return hv.Curve(dict(Date=data[0], Value=data[1]), 'Date', (('Value', data[2])))

dmap = hv.DynamicMap(timeseries, streams=[pipe])
datashade(dmap).opts(
    width=1200,  height=600, tools=['xwheel_zoom', 'pan'],
    active_tools=['xwheel_zoom', 'pan'], default_tools= ['reset', 'ywheel_zoom', 'save', hover]
)

Bug:

future: <Future finished exception=UFuncTypeError(<ufunc 'true_divide'>, (dtype('<M8[ns]'), dtype('float64')))>
Traceback (most recent call last):
  File "c:\users\catal\appdata\local\programs\python\python36\lib\site-packages\tornado\gen.py", line 191, in wrapper
    result = func(*args, **kwargs)
  File "c:\users\catal\appdata\local\programs\python\python36\lib\site-packages\holoviews\plotting\bokeh\callbacks.py", line 418, in process_on_change
    self.on_msg(msg)
  File "c:\users\catal\appdata\local\programs\python\python36\lib\site-packages\holoviews\plotting\bokeh\callbacks.py", line 141, in on_msg
    processed_msg = self._process_msg(filtered_msg)
  File "c:\users\catal\appdata\local\programs\python\python36\lib\site-packages\holoviews\plotting\bokeh\callbacks.py", line 815, in _process_msg
    x0 = convert_timestamp(x0)
  File "c:\users\catal\appdata\local\programs\python\python36\lib\site-packages\holoviews\plotting\bokeh\util.py", line 98, in convert_timestamp
    datetime = dt.datetime.utcfromtimestamp(timestamp/1000.)
numpy.core._exceptions.UFuncTypeError: ufunc 'true_divide' cannot use operands with types dtype('<M8[ns]') and dtype('float64')

But if I restart the server and use the xwheel_zoom first works perfectly:

Thank You,

Josu Catalina.

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