SavePointReached/Left Prompt in MFC for Undo/Redo(Scintilla App)

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MFC

Hi,

I am using Scintilla Editor in MFC TDI application, wherein, the issue is when user modifies, the document by adding text and does undo the change, using context/main menu, the document prompts for SAVE,
I changed has follows but, when I modify file, say 1.c and close , I get prompt, but other files along with 1.c even though non- modified, displays prompt.

My query, is the how we can resolve the issue, wherein the prompt displays for the document modified only.
Here default code has been provided by scintillamfc application(Code Project) given by bold

we implemented below code for SavePointReached

CMyView::OnNotify()
{
case SCN_SAVEPOINTREACHED:
   {
    CDocument*pDoc = GetDocument();
    pDoc->SetModifiedFlag(FALSE);
    .....
    
         break;
}

Whereas 
SCN_SAVEPOINTLEFT:
CDocument *pDoc = GetDocument();

//pDoc->SetModifiedFlag(FALSE);

pDoc->SetModifiedFlag(TRUE);

break;
}

what is the rationale of using just

SCN_SAVEPOINTREACHED:
break;

instead.,

Please clarify.

Thanks in Advance,