Miscellaneous stream fixes (#2256)

holoviews/plotting/bokeh/callbacks.py

@@ -56,6 +56,10 @@ def __init__(self, plot, streams, source, **params):
             except AttributeError:
                 self.comm = Comm(plot)
         self.source = source
+        self.reset()
+
+
+    def reset(self):
         self.handle_ids = defaultdict(dict)
         self.callbacks = []
         self.plot_handles = {}

holoviews/plotting/bokeh/chart.py

@@ -506,6 +506,8 @@ def get_data(self, element, ranges, style):
 
 class AreaPlot(SpreadPlot):
 
+    _stream_data = False # Plot does not support streaming data
+
     def get_extents(self, element, ranges):
         vdims = element.vdims
         vdim = vdims[0].name

holoviews/plotting/bokeh/plot.py

@@ -240,6 +240,9 @@ def sync_sources(self):
                     else:
                         renderer.update(source=new_source)
                     plot.handles['source'] = new_source
+                    for callback in plot.callbacks:
+                        callback.reset()
+                        callback.initialize()
                 shared_sources.append(new_source)
                 source_cols[id(new_source)] = [c for c in new_source.data]
         self.handles['shared_sources'] = shared_sources

holoviews/plotting/bokeh/tabular.py

@@ -80,6 +80,9 @@ def initialize_plot(self, ranges=None, plot=None, plots=None, source=None):
         self._execute_hooks(element)
         self.drawn = True
 
+        for cb in self.callbacks:
+            cb.initialize()
+
         return table