Fix vectorfield hover (#6258)

holoviews/plotting/bokeh/chart.py

@@ -318,7 +318,20 @@ def get_data(self, element, ranges, style):
         elif cdim:
             color = cdata.get(cdim.name)
 
-        data = {'x0': x0s, 'x1': x1s, 'y0': y0s, 'y1': y1s}
+        data = {
+            'x0': x0s,
+            'x1': x1s,
+            'y0': y0s,
+            'y1': y1s,
+        }
+        if 'hover' in self.handles:
+            data.update({
+                # tile to match the length of the segments
+                "x": np.tile(xs, 3),
+                "y": np.tile(ys, 3),
+                "Angle": np.tile(rads, 3),
+                "Magnitude": np.tile(lens, 3)
+            })
         mapping = dict(x0='x0', x1='x1', y0='y0', y1='y1')
         if cdim and color is not None:
             data[cdim.name] = color
@@ -327,7 +340,6 @@ def get_data(self, element, ranges, style):
         return (data, mapping, style)
 
 
-
 class CurvePlot(ElementPlot):
 
     padding = param.ClassSelector(default=(0, 0.1), class_=(int, float, tuple))

holoviews/tests/plotting/bokeh/test_vectorfieldplot.py

@@ -83,3 +83,17 @@ def test_vectorfield_color_index_color_clash(self):
             "for 'line_color' option and declare a color_index; ignoring the color_index.\n"
         )
         self.assertEqual(log_msg, warning)
+
+    def test_vectorfield_no_hover_columns(self):
+        vectorfield = VectorField([(0, 0, 0), (0, 1, 1), (0, 2, 2)],
+                        vdims='color').opts(tools=[])
+        plot = bokeh_renderer.get_plot(vectorfield)
+        keys = sorted(plot.handles["cds"].data)
+        assert keys == ["x0", "x1", "y0", "y1"]
+
+    def test_vectorfield_hover_columns(self):
+        vectorfield = VectorField([(0, 0, 0), (0, 1, 1), (0, 2, 2)],
+                        vdims='color').opts(tools=["hover"])
+        plot = bokeh_renderer.get_plot(vectorfield)
+        keys = sorted(plot.handles["cds"].data)
+        assert keys == ["Angle", "Magnitude", "x", "x0", "x1", "y", "y0", "y1"]