Bug summary

When adding contour label positions manually (either via clicking or specifying an iterable of positions), contours with disconnected parts are not handled correctly, but sometimes rejoined seemingly arbitrarily.

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np
fig, ax = plt.subplots()
x, y = np.mgrid[-1:1:21j, -1:1:21j]

cs = ax.contour(x, y, 1/np.sqrt(0.01+(x+0.3)**2+y**2) + 1/np.sqrt(0.01+(x-0.3)**2+y**2), levels=[7])
cs.clabel(manual=[(0.2, 0.1)])

Actual outcome

Expected outcome

As it looked in matplotlib 3.7.3:

Additional information

No response

Operating system

No response

Matplotlib Version

3.8.0

Matplotlib Backend

No response

Python version

No response

Jupyter version

No response

Installation

conda