Enable the follow feature for string op-code:

1. Show old string before enter new.
2. Enable cursor moves left or right and insert new char or remove the char before the cursor.

Signed-off-by:ydong10
Reviewed-by:lgao4



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12231 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/SetupBrowserDxe/ProcessOptions.c

@@ -740,6 +740,7 @@ ProcessOptions (
     if (Selected) {
       StringPtr = AllocateZeroPool ((Maximum + 1) * sizeof (CHAR16));
       ASSERT (StringPtr);
+      CopyMem(StringPtr, Question->BufferValue, Maximum * sizeof (CHAR16));
 
       Status = ReadString (MenuOption, gPromptForData, StringPtr);
       if (!EFI_ERROR (Status)) {