[Bug]: [Group Flip] Scaling Flip Group then Scaling Flip its child object, the child object behavior is wrong

[ritali4912]

CheckList

• I agree to follow this project's Code of Conduct
• I have read and followed the Contributing Guide
• I have read and followed the Issue Tracker Guide
• I have searched and referenced existing issues and discussions
• I am filing a BUG report.
• I have managed to reproduce the bug after upgrading to the latest version
• I have created an accurate and minimal reproduction

Version

6.0.0-rc1

In What environments are you experiencing the problem?

Microsoft Edge

Node Version (if applicable)

None

Link To Reproduction

https://codesandbox.io/p/sandbox/fabric-vanillajs-sandbox-forked-qf599w

Steps To Reproduce

Actually I'm using the master in above reproduce link.

I want to verify the PR 9801, then I found a new issue.

1. Scaling flip the Group first
2. Scaling Flip one child object

The wrong behavior like below gif.

Expected Behavior

The child object inside group can be scaling flip correctly no matter I flip the Group or not.

Actual Behavior

The original issue fixed by PR9801 is gone which is: Don't scaling flip the group, only scaling flip the child object. But it seems the fix is not complete.
Refer to below gif.

Error Message & Stack Trace

No response

[asturur]

I m not sure i will be able to fix that, because i already tried and fix some other use cases of it.
The fact that the object will flip is something we can't do much about, is how the transformations are calculated and while you could argue that for a simple flip you can calculate when an object should be flipped, that become almost impossible when the transformations stack differently.

Can you please check how this use case was behaving before i merged the fix for your previous issue?
I need to understand if i broke something in case i have to consider reverting

[ritali4912]

@asturur I think you are not break anything.
Here is the reproduce on beta 20: https://jsfiddle.net/ritali4912/51afjotp/73/

The Use Cases are:

1. Flip Child object inside Group only (not flip group)
   This is the one fixed by PR 9801, and the behavior is correct on master.

master behavior as below gif:

The behavior on beta 20 is wrong, refer to below gif.

2. Flip Group -> Flip Child object
   This issue both on master and beta 20.

master behavior:

The behavior on beta 20, refer to below gif:

The different between the beta20 and master you can see:

1. On beta20, if I directly flip group then I can see the child object is:
   

2. On master, if I directly flip group then the child object is
   

[ShaMan123]

related #8743?

[asturur]

no i think #8743 has been fixed in the previous PR, a flipped object inside a group, this is slightly different and hopefully a different root cause.