There is a code in  Edit and HexEdit that tries to locate simple text pointer 
splitter using the following call:
Status = gBS->HandleProtocol (
                gST->ConIn,
                &gEfiSimplePointerProtocolGuid,
                (VOID**)&MainEditor.MouseInterface
                );

The first parameter should be gST->ConInHandle instead of gST->ConIn.
gST->ConIn is not a handle . It's an instance of SimpleTextIn.
=

Here is the exact code location based on revision 15558:
ShellPkg\Library\UefiShellDebug1CommandsLib\Edit\MainTextEditor.c, line 1459
ShellPkg\Library\UefiShellDebug1CommandsLib\HexEdit\MainHexEditor.c, line 1640

There is also similar issue in the old EdkShell (Is it still maintained?):
EdkShell\edit\libEditor.c, line 124
EdkShell\hexedit\libEditor.c, line 137
( Based on rev. 64 of https://svn.code.sf.net/p/efi-shell/code/trunk/Shell )

Thanks
Felix

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