Some cleanups to avoid unnecessary getString() calls.

Change-Id: I334d64f7731915d27e3b81781c91e330dc446010

sc/source/core/data/column.cxx

@@ -1866,7 +1866,7 @@ public:
                 for (; it != itEnd; ++it, ++nRow)
                 {
                     const svl::SharedString& rStr = *it;
-                    if (rStr.getString().isEmpty())
+                    if (rStr.isEmpty())
                     {
                         // String cell with empty value is used to special-case cell value removal.
                         maDestPos.miCellPos = mrDestCol.GetCellStore().set_empty(

sc/source/core/data/column2.cxx

@@ -578,11 +578,10 @@ public:
 
     void operator() (size_t /*nRow*/, const svl::SharedString& rSS)
     {
-        OUString aStr = rSS.getString();
-        if (aStr.getLength() > mnMaxLen)
+        if (rSS.getLength() > mnMaxLen)
         {
-            mnMaxLen = aStr.getLength();
-            maMaxLenStr = aStr;
+            mnMaxLen = rSS.getLength();
+            maMaxLenStr = rSS.getString();
         }
     }
 

sc/source/filter/excel/excrecds.cxx

@@ -721,10 +721,9 @@ bool XclExpAutofilter::AddEntry( const ScQueryEntry& rEntry )
     bool bConflict = false;
     OUString  sText;
     const ScQueryEntry::Item& rItem = rItems[0];
-    OUString aQueryStr = rItem.maString.getString();
-    if (!aQueryStr.isEmpty())
+    if (!rItem.maString.isEmpty())
     {
-        sText = aQueryStr;
+        sText = rItem.maString.getString();
         switch( rEntry.eOp )
         {
             case SC_CONTAINS:

sc/source/filter/xml/XMLChangeTrackingExportHelper.cxx

@@ -294,12 +294,11 @@ void ScChangeTrackingExportHelper::WriteStringCell(const ScCellValue& rCell)
 
     rExport.AddAttribute(XML_NAMESPACE_OFFICE, XML_VALUE_TYPE, XML_STRING);
     SvXMLElementExport aElemC(rExport, XML_NAMESPACE_TABLE, XML_CHANGE_TRACK_TABLE_CELL, true, true);
-    OUString aStr = rCell.mpString->getString();
-    if (!aStr.isEmpty())
+    if (!rCell.mpString->isEmpty())
     {
         SvXMLElementExport aElemP(rExport, XML_NAMESPACE_TEXT, XML_P, true, false);
         bool bPrevCharWasSpace(true);
-        rExport.GetTextParagraphExport()->exportText(aStr, bPrevCharWasSpace);
+        rExport.GetTextParagraphExport()->exportText(rCell.mpString->getString(), bPrevCharWasSpace);
     }
 }