* Add regression tests for four recent fixes in vectorized_mobject.py
Adds four regression tests for fixes that landed without tests in the same PR:
* 21cf9998 (PR #4630, fixes#3569 + #4629) -- IndexError in
`get_nth_subpath` when `path_list` is empty; ensure it always returns
a NumPy array.
* f6cdb547 (PR #4219) -- `add_points_as_corners` silently dropped a
single new point when called on a VMobject whose last subpath was
complete.
* 3d029c12 (PR #4320, fixes#4255) -- `pointwise_become_partial` cleared
the target's points when the source had no cubic curves, surfacing as
`Arrow3D.get_start()` / `get_end()` returning the origin after a
`Create` animation.
* 429f25328 (PR #4694) -- `scale(scale_stroke=True)` on a compound
VMobject propagated the parent's scaled stroke width to every
submobject, overwriting submobjects with their own (e.g. zero) stroke.
Each test reproduces the original failing condition at the unit level
and asserts the post-fix behavior. Validation: every test was confirmed
to fail when the corresponding fix is reverted on the source file, and
pass when the fix is restored.
4 tests, ~0.2s runtime. Tests go in the existing files
`tests/module/mobject/types/vectorized_mobject/test_vectorized_mobject.py`
(three tests, adjacent to their topically-related siblings) and
`tests/module/mobject/types/vectorized_mobject/test_stroke.py` (one test,
next to the existing `test_stroke_scale`).
Co-authored-by: LetMarq <LetMarq@users.noreply.github.com>
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Co-authored-by: THE-RAF <THE-RAF@users.noreply.github.com>
Co-authored-by: LetMarq <LetMarq@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Francisco Manríquez Novoa <49853152+chopan050@users.noreply.github.com>
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