[FR]: Global zIndex Manipulation Command

[mym0404]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the problem

I misunderstood about zIndex of overlays. It was a additional zIndex used to compare each overlay has same globalZIndex.

Describe the solution

Set default zIndex of each overlay as zero and add a new command method setGlobalZIndexFor(...)

Additional context

No response

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