# Buggy code
def edge_color(self, edge_color):
    # if the provided face color is a string, first check if it is a key in the properties.
    # otherwise, assume it is the name of a color
    if self._is_color_mapped(edge_color):
        if guess_continuous(self.properties[edge_color]):
            self._edge_color_mode = ColorMode.COLORMAP
        else:
            self._edge_color_mode = ColorMode.CYCLE
        self._edge_color_property = edge_color
        self.refresh_colors()

    else:
        transformed_color = transform_color_with_defaults(
            num_entries=len(self.data),
            colors=edge_color,
            elem_name="edge_color",
            default="white",
        )
        self._edge_color = normalize_and_broadcast_colors(
            len(self.data), transformed_color
        )
        self.edge_color_mode = ColorMode.DIRECT
        self._edge_color_property = ""

        self.events.edge_color()
        self.events.highlight()


# Traceback (ValueError)
WARNING: Traceback (most recent call last):
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/_qt/qt_viewer_buttons.py", line 173, in <lambda>
lambda state=self: self.change_ndisplay(state)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/_qt/qt_viewer_buttons.py", line 178, in change_ndisplay
self.viewer.dims.ndisplay = 3
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/dims.py", line 296, in ndisplay
self.events.ndisplay()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 508, in __call__
self._invoke_callback(cb, event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 529, in _invoke_callback
cb_event=(cb, event),
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 523, in _invoke_callback
cb(event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/viewer_model.py", line 88, in <lambda>
self.dims.events.ndisplay.connect(lambda e: self._update_layers())
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/viewer_model.py", line 1037, in _update_layers
layer.dims.ndisplay = self.dims.ndisplay
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/dims.py", line 296, in ndisplay
self.events.ndisplay()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 508, in __call__
self._invoke_callback(cb, event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 529, in _invoke_callback
cb_event=(cb, event),
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 523, in _invoke_callback
cb(event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/base/base.py", line 180, in <lambda>
self.dims.events.ndisplay.connect(lambda e: self._update_dims())
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/base/base.py", line 383, in _update_dims
self.refresh()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/base/base.py", line 600, in refresh
self._set_view_slice()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/points/points.py", line 654, in _set_view_slice
self._selected_box = self.interaction_box(self._selected_view)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/points/points.py", line 480, in interaction_box
data = points_to_squares(data, size)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/points/points.py", line 972, in points_to_squares
points + np.sqrt(2) / 2 * np.array([sizes, sizes]).T,
ValueError: operands could not be broadcast together with shapes (1,3) (1,2)
WARNING:vispy:Traceback (most recent call last):
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/_qt/qt_viewer_buttons.py", line 173, in <lambda>
lambda state=self: self.change_ndisplay(state)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/_qt/qt_viewer_buttons.py", line 178, in change_ndisplay
self.viewer.dims.ndisplay = 3
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/dims.py", line 296, in ndisplay
self.events.ndisplay()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 508, in __call__
self._invoke_callback(cb, event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 529, in _invoke_callback
cb_event=(cb, event),
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 523, in _invoke_callback
cb(event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/viewer_model.py", line 88, in <lambda>
self.dims.events.ndisplay.connect(lambda e: self._update_layers())
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/viewer_model.py", line 1037, in _update_layers
layer.dims.ndisplay = self.dims.ndisplay
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/components/dims.py", line 296, in ndisplay
self.events.ndisplay()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 508, in __call__
self._invoke_callback(cb, event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 529, in _invoke_callback
cb_event=(cb, event),
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/utils/event.py", line 523, in _invoke_callback
cb(event)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/base/base.py", line 180, in <lambda>
self.dims.events.ndisplay.connect(lambda e: self._update_dims())
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/base/base.py", line 383, in _update_dims
self.refresh()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/base/base.py", line 600, in refresh
self._set_view_slice()
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/points/points.py", line 654, in _set_view_slice
self._selected_box = self.interaction_box(self._selected_view)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/points/points.py", line 480, in interaction_box
data = points_to_squares(data, size)
File "/home/hagai/.conda/envs/ncd/lib/python3.7/site-packages/napari/layers/points/points.py", line 972, in points_to_squares
points + np.sqrt(2) / 2 * np.array([sizes, sizes]).T,
ValueError: operands could not be broadcast together with shapes (1,3) (1,2)

# Fixed code
def edge_color(self, edge_color):
    # if the provided face color is a string, first check if it is a key in the properties.
    # otherwise, assume it is the name of a color
    if self._is_color_mapped(edge_color):
        if guess_continuous(self.properties[edge_color]):
            self._edge_color_mode = ColorMode.COLORMAP
        else:
            self._edge_color_mode = ColorMode.CYCLE
        self._edge_color_property = edge_color
        self.refresh_colors()

    else:
        transformed_color = transform_color_with_defaults(
            num_entries=len(self.data),
            colors=edge_color,
            elem_name="edge_color",
            default="white",
        )
        self._edge_color = normalize_and_broadcast_colors(
            len(self.data), transformed_color
        )
        self.edge_color_mode = ColorMode.DIRECT
        self._edge_color_property = ""

        self.events.edge_color()