Duplicate functions lead to malfunctioning of treeview

[paul0314]

Describe the bug

Duplicate functions lead to the malfunctioning of the treeview.
After clicking on a duplicated function there remains an afterimage of it in the foreground even after selecting different elements. Also on click both functions are selected.

Additionally, I think that this is a parsing error. Can you check if in your latest version of the API there are still two power functions inside sklearn._loss.glem_distribution/TweedieDistribution? I think I'm already using the latest, but if not I'll update.

To Reproduce

Steps to reproduce the behavior:

Reproduction:

1. Open sklearn._loss.glm_distribution
   
2. Click on one of the power functions inside TweedieDistribution
   
3. Open one of the higher up modules
   

[lars-reimann]

There are two functions since power is a property:

@property
def power(self):
    return self._power

@power.setter
def power(self, power):
    # We use a property with a setter, to update lower and
    # upper bound when the power parameter is updated e.g. in grid
    # search.
    if not isinstance(power, numbers.Real):

I'll see what can be done about this.