[MAYA-104456] Outliner: Cannot MMB drag to re-parent prim between children.

[gracekumagai]

Describe the bug
Cannot re-parent a prim by MMB dragging the prim under another parent and between the parent's children.

We can rearrange a prim by MMB dragging between it's siblings. We can also re-parent a prim by MMB dragging the prim directly onto the parent. However, it seems like we cannot re-parent and re-arrange in 1 step.

Steps to reproduce
Steps to reproduce the behavior:

1. Open a new file in Maya 2022
2. Navigate to Create -> Universal Scene Description (USD) -> Stage with new layer
3. Right click on the proxy shape -> Add new prim -> Capsule
4. Click on the Capsule and duplicate 3 times (Ctrl+d)
5. Select 3 of the capsules and group them together (Ctrl+g)
6. Click on the ungrouped capsule and MMB drag in between the the other capsules. The ungrouped capsule will not be re-parented or re-arranged in between the other capsules.

Expected behavior
We would expect the user to have the same behaviour as native Maya where they are able to MMB drag a prim under another parent and insert it between that parent's children.

Attachments
Steps 3-6

Comparing the behaviour between ufe (with the kitchen set) and maya nodes in the outliner:

Spec:
OS (Linux 64 bit)
Maya USD: dev at 4710d36
Pixar USD: dev at 96c5a3f
Maya 2022.update2

[santosd]

Hello Grace,

Thank you for logging this issue. I took a look on my end in the PR129 release and was able to reproduce the same behavior, I will go ahead and log this internally so that we can have a dev take a look.

-David Santos

[gracekumagai]

Hi David,
Thank you so much for looking into this issue so quickly!
Grace

[santosd]

No problem at all. I logged it internally as MAYA-114310

[gracekumagai]

Also, I noticed this strange behaviour when trying to place MMB place an object in different places.

If it's dragged:

• Between the group and the 1st child, it auto-collapses the group and rearranges the dragged prim to be above the group
• Between the last and 2nd to last child, it auto-collapses the group and rearranges the dragged prim to be below the group
• Between the other children, nothing happens.

Thanks!

[wtelford]

Hey @santosd, Can you link this to MAYA-104456?

[santosd]

I have linked it with the internal story that will resolve the issue.

[maya-usd-git-sync]

Issue synced internally to EMSUSD-676