Fix issues with linked selections on tables (#4758)

holoviews/plotting/bokeh/selection.py

@@ -14,7 +14,7 @@ def _build_selection(self, el, exprs, **kwargs):
             opts['selected'] = list(np.where(mask)[0])
         return el.opts(clone=True, backend='bokeh', **opts)
 
-    def build_selection(self, selection_streams, hvobj, operations, region_stream=None):
+    def build_selection(self, selection_streams, hvobj, operations, region_stream=None, cache={}):
         sel_streams = [selection_streams.exprs_stream]
         hvobj = hvobj.apply(self._build_selection, streams=sel_streams, per_element=True)
         for op in operations:

holoviews/selection.py

@@ -106,6 +106,8 @@ def _register(self, hvobj):
         Register an Element or DynamicMap that may be capable of generating
         selection expressions in response to user interaction events
         """
+        from .element import Table
+
         # Create stream that produces element that displays region of selection
         selection_expr_seq = SelectionExprSequence(
             hvobj, mode=self.selection_mode, include_region=self.show_regions,
@@ -122,8 +124,9 @@ def clear_stream_history(resetting, stream=selection_expr_seq.history_stream):
                 stream.clear_history()
                 stream.event()
 
-        mode_stream = SelectMode(source=hvobj)
-        mode_stream.param.watch(self._update_mode, 'mode')
+        if not isinstance(hvobj, Table):
+            mode_stream = SelectMode(source=hvobj)
+            mode_stream.param.watch(self._update_mode, 'mode')
 
         self._plot_reset_streams[hvobj].param.watch(
             clear_stream_history, ['resetting']