PR Summary

import matplotlib.pyplot as plt
from matplotlib.widgets import SpanSelector
import numpy as np

values = np.arange(0, 100)

fig = plt.figure()
ax = fig.add_subplot()
ax.plot(values, values)

selector = SpanSelector(ax, print, interactive=True)
# press escape key and move the mouse over the area where the span selector was: the mouse pointer will change
# when hovering over the edge handle even if the span selector is not visible anymore.

PR Checklist

• Has pytest style unit tests (and pytest passes).
• Is Flake 8 compliant (run flake8 on changed files to check).
• [N/A] New features are documented, with examples if plot related.
• [N/A] Documentation is sphinx and numpydoc compliant (the docs should build without error).
• Conforms to Matplotlib style conventions (install flake8-docstrings and run flake8 --docstring-convention=all).
• [N/A] New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
• [N/A] API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).