Using matplotlib before mesh triangulation makes the triangulation fail.

[TheoRGirard]

I've been using the triangle lib a lot and I frequently get the following RuntimeError :

File "triangle/core.pyx", line 252, in triangle.core.triang
RuntimeError: Triangulation failed -- probably because of invalid geometry on input.

It happens this occurs if and only if I have used matplotlib before calling the triangulate function.
Here is a code sample I use to get the RuntimeError:

  import matplotlib.pyplot as plt
  import triangle as tr
  
  plt.plot([0,1,2],[1,-1,1])
  plt.show()
  
  vertices = [[0,0],[0,1],[1,0]]
  segments = [[0,1],[1,2],[2,0]]
  domain_dict = {"vertices" : vertices,
                 "segments" : segments,
                 }
  
  mesh_dict = tr.triangulate(domain_dict, "q10pa0.1")

As a contrast, if I use the following code (without the matplotlib plot), I get a perfectly fine mesh without any RuntimeError:

import matplotlib.pyplot as plt
import triangle as tr

vertices = [[0,0],[0,1],[1,0]]
segments = [[0,1],[1,2],[2,0]]
domain_dict = {"vertices" : vertices,
               "segments" : segments,
               }

mesh_dict = tr.triangulate(domain_dict, "q10pa0.1")

I run these codes on Ubuntu 22.04,
Python versions tested 3.9 to 3.13,
I use python-uv as a dependancy and venv manager, you can recreate the exact env I use with:

uv init 
uv add matplotlib, pyqt6, triangle