with show changes on we can have negative offsets

for counting words in a range of text which has redline deleted
text at the start

Change-Id: I34149822d43f8ee3fbde58a166dad408fb588fce

sw/source/core/bastyp/breakit.cxx

@@ -175,7 +175,7 @@ sal_Int32 SwBreakIt::getGraphemeCount(const OUString& rText,
 {
     sal_Int32 nGraphemeCount = 0;
 
-    sal_Int32 nCurPos = nStart;
+    sal_Int32 nCurPos = std::max(0, nStart);
     while (nCurPos < nEnd)
     {
         // fdo#49208 cheat and assume that nothing can combine with a space

sw/source/core/txtnode/txtedt.cxx

@@ -730,6 +730,8 @@ SwScanner::SwScanner( const SwTxtNode& rNd, const OUString& rTxt,
         OUStringBuffer aBuf(aPreDashReplacementText);
         for (sal_Int32 i = nStartPos; i < nEndPos; ++i)
         {
+            if (i < 0)
+                continue;
             sal_Unicode cChar = aBuf[i];
             if (sDashes.indexOf(cChar) != -1)
             {
@@ -805,9 +807,9 @@ bool SwScanner::NextWord()
     while ( true )
     {
         // skip non-letter characters:
-        while ( nBegin < aText.getLength() )
+        while (nBegin < aText.getLength())
         {
-            if ( !u_isspace( aText[nBegin] ) )
+            if (nBegin >= 0 && !u_isspace(aText[nBegin]))
             {
                 if ( !pLanguage )
                 {