[RFC] [MdePkg] UefiLib: CreatePopUp

[Felix Poludov <Felixp@ami.com>]

UefiLib library class (MdePkg ) includes CreatePopUp function.
The function displays a message box.
There is certainly more than one way to draw a message box.
If homogenous user interface is a project requirement,
CreatePopUp is likely to be overridden to align message box appearance with the platform look and feel.
The function can be overridden by creating a project specific UefiLib instance, but this seems like an overkill
because the rest of the UefiLib, which is quite big, would have to be duplicated.

One way to solve the problem is to move CreatePopUp to a new library class, however, this may break existing projects.
I suggest changing CreatePopUp implementation to delegate pop up drawing to a new
function UiCreatePopUp provided by a new library class UiLib.h.

I would like to solicit feedback for this proposal.
If there will be no major objections, I'll start working on a patch.

Thanks
Felix

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