armature.saveBindPose() corrupts model

[yaRnMcDonuts]

As reported here: https://hub.jmonkeyengine.org/t/issue-calling-armature-savebindpose/48046

Essentially, calling saveBindPose() many times will eventually corrupt/distort the model's bind pose.

My best guess so far is that the inverseModelBindMatrix value in this class at this line ends up corrupted from repeatedly being modified one way or another: SeparateJointModelTransform.java#L33

[stephengold]

Is this a recent regression? I haven't investigated, but I'd expect the same issue existed in v3.7.0-stable and perhaps even earlier.

[yaRnMcDonuts]

I first experienced this issue with 3.7 stable, but haven't tested on any earlier versions.