Part of #135062.
This PR adds an Auto Normalize option in the Vertex Group panel that
when checked will normalize the other deform-bone vertex groups' weights
when assigning the weight of a deform-bone vertex group. For example if
a selected vertex has the following weights:
| Name | Weight |
|---------|--------|
| Group 1 | 0.2 |
| Group 2 | 0.2 |
| Group 3 | 0.6 |
And the user selects Group 3, checks the Auto Normalize checkbox, sets
the weight to 0.8, and clicks Assign, the new weights will be:
| Name | Weight |
|---------|--------|
| Group 1 | 0.1 |
| Group 2 | 0.1 |
| Group 3 | 0.8 |
Co-authored-by: Andy Beers <acbeers1@gmail.com>
Pull Request: https://projects.blender.org/blender/blender/pulls/138133
4e7dfcbe3f