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// @mfunc Replace a text in a selection or in the complete file multiple times
// @rvalue int | number of replacements
//
int CScintillaWnd::ReplaceAll(
                              LPCSTR szFind, 
                              LPCSTR szReplace, 
                              BOOL bUseSelection)
{
   int nCount = 0;
// different branches for replace in selection or total file
   if (bUseSelection)
   {
//    get starting selection range
      long lLen = 0;
      long lStart = GetSelectionStart();
      long lEnd = GetSelectionEnd();
//    set target to selection
      SendMessage(SCI_SETTARGETSTART, lStart);
      SendMessage(SCI_SETTARGETEND, lEnd);
//    try to find text in target for the first time
       long lPos = SendMessage(SCI_SEARCHINTARGET, strlen(szFind), (long)szFind);
//    loop over selection until end of selection reached - moving the target start each time
      while (lPos < lEnd && lPos >= 0)
      {
         if (m_nSearchflags & SCFIND_REGEXP) // check for regular expression flag
            lLen = SendMessage(SCI_REPLACETARGETRE, strlen(szReplace), (long)szReplace);
         else
            lLen = SendMessage(SCI_REPLACETARGET, strlen(szReplace), (long)szReplace);
//       the end of the selection was changed - recalc the end
         lEnd = GetSelectionEnd();
//       move start of target behind last change and end of target to new end of selection
         SendMessage(SCI_SETTARGETSTART, lPos+lLen);
         SendMessage(SCI_SETTARGETEND, lEnd);
//       find again - if nothing found loop exits
          lPos = SendMessage(SCI_SEARCHINTARGET, strlen(szFind), (long)szFind);
         nCount++;
      }
   }
   else
   {
//    start with first and last char in buffer
      long lLen = 0;
      long lStart = 0;
      long lEnd = SendMessage(SCI_GETTEXTLENGTH, 0, 0);
//    set target to selection
      SendMessage(SCI_SETTARGETSTART, lStart, 0);
      SendMessage(SCI_SETTARGETEND, lEnd, 0);
//    try to find text in target for the first time
       long lPos = SendMessage(SCI_SEARCHINTARGET, strlen(szFind), (long)szFind);
//    loop over selection until end of selection reached - moving the target start each time
      while (lPos < lEnd && lPos >= 0)
      {
         if (m_nSearchflags & SCFIND_REGEXP) // check for regular expression flag
            lLen = SendMessage(SCI_REPLACETARGETRE, strlen(szReplace), (long)szReplace);
         else
            lLen = SendMessage(SCI_REPLACETARGET, strlen(szReplace), (long)szReplace);
//       the end of the selection was changed - recalc the end
         lEnd = SendMessage(SCI_GETTEXTLENGTH, 0, 0);;
//       move start of target behind last change and end of target to new end of buffer
         SendMessage(SCI_SETTARGETSTART, lPos+lLen);
         SendMessage(SCI_SETTARGETEND, lEnd);
//       find again - if nothing found loop exits
          lPos = SendMessage(SCI_SEARCHINTARGET, strlen(szFind), (long)szFind);
         nCount++;
      }
   }
   return nCount;
}