added guiEvent to PickEvent

[eyurtsev]

PickEvent.guiEvent is currenly set to None. However, the guiEvent is available within PickEvent.mouseevent.guiEvent. This looks like it was done by design, but I feel like it's somewhat of an API inconsistency.

Example of what I was trying to do that didn't work:

import matplotlib
import numpy as np
import matplotlib.pyplot as plt

def onpick(event):
    print event.mouseevent.guiEvent # <-- available
    print event.guiEvent # <--  no available, but this is what I expect to be able to use

x = [1, 2, 3]
y = [1, 2, 3]

fig, ax = plt.subplots()
ax.scatter(x, y, picker=True)
fig.canvas.mpl_connect('pick_event',  onpick)
plt.show()

[tacaswell]

I see no harm in this and it brings pick events up to match everything else.

👍 from me.

[blink1073]

👍 thanks @eyurtsev!