Commits on Oct 22, 2023

1. Fixed an off-by-one index check in Element::setChildIndex(). …

   Extended the existing test case:
   valid values for `index` in the test case are `0` and `1` only.
   
   Minimal repro via Python bindings:
   ```bash
   $ python3 -c 'import MaterialX as mx; d = mx.createDocument(); b = d.addBackdrop(); d.setChildIndex(b.getName(), 1)'
   ```
   Without this patch:
   ```bash
   Segmentation fault
   ```
   With this patch:
   ```python
   Traceback (most recent call last):
     File "<string>", line 1, in <module>
   LookupError: Invalid child index
   ```
   
   Ran the tests locally via `make && make test`:
   ```bash
   100% tests passed, 0 tests failed out of 73
   ```
   
   Update AcademySoftwareFoundation#1581
   
   Signed-off-by: Stefan Habel <[email protected]>

   

   StefanHabel committed Oct 22, 2023
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