fix cut and paste into macro editor crash

e.g. select all in macro editor in virtualbox and paste
into Linux macro editor and explode in debugging iterator
land.

regression due to IA2 integration of
efb23f29

Change-Id: Ic7a4e9f5455f4ba3eaf0afd38fd5e445d6dc28e6

accessibility/source/extended/textwindowaccessibility.cxx

@@ -2219,15 +2219,24 @@ void Document::handleParagraphNotifications()
 
 void Document::sendEvent(::sal_Int32 start, ::sal_Int32 end, ::sal_Int16 nEventId)
 {
-     Paragraphs::iterator aEnd = ::std::min(m_xParagraphs->begin() + end + 1, m_aVisibleEnd);
-    for (Paragraphs::iterator aIt = ::std::max(m_xParagraphs->begin() + start, m_aVisibleBegin);
-         aIt < aEnd; ++aIt)
+    size_t nAvailDistance = std::distance(m_xParagraphs->begin(), m_aVisibleEnd);
+
+    Paragraphs::iterator aEnd(m_xParagraphs->begin());
+    size_t nEndDistance = std::min<size_t>(end + 1, nAvailDistance);
+    std::advance(aEnd, nEndDistance);
+
+    Paragraphs::iterator aIt(m_xParagraphs->begin());
+    size_t nStartDistance = std::min<size_t>(start, nAvailDistance);
+    std::advance(aIt, nStartDistance);
+
+    while (aIt < aEnd)
     {
         ::rtl::Reference< Paragraph > xParagraph(getParagraph(aIt));
         if (xParagraph.is())
             xParagraph->notifyEvent(
             nEventId,
                 ::css::uno::Any(), ::css::uno::Any());
+        ++aIt;
     }
 }