Update contour tests for alpha

[Adam-Ladd]

My previous commit added the ability to set alpha for contours. However, this caused a couple of the existing tests to fail as alpha=1 is added to the opt String. This commit fixes that as default (alpha=1 value is now added to the test opt string`

P.S. the test test_canvas_glyph_3d_and_hide_3d_grid is currently failing. However this fails on previous commits so and is unrelated to my contributions.

[cpmech]

Hi, I've just published a new version (1.20.0) with the ability to set alpha in Contour. I've added two functions: set_fill_alpha and set_line_alpha to set the transparency for the filled Contour and line contour, respectively. I've also fixed the tests.

On my end, and in the GitHub actions, test_canvas_glyph_3d_and_hide_3d_grid seems fine. If it is failing in your system, can you please check line # 561 of the test_canvas.rs file with the following check:

assert!(n > 850 && n < 910);

Depending on the Python and/or Matplotlib version and the system, such a range may vary slightly.

[Adam-Ladd]

Grand, sorry for the slightly sloppy PR.

On my machine test_canvas_glyph_3d_and_hide_3d_grid is failing with a line count of 974 my development environment is a fedora container with python 3.14.2 and matplotlib 3.10.8

[cpmech]

Ok, I've increased the lower and upper limit (1000) in the main branch. So, if you update your fork, it should work now for you. Thanks again.