coverity#1371289 Missing move assignment operator

Change-Id: Idc26faf904f0c89cfd66f53bb311d8ce9b41eaab

i18nutil/source/utility/unicode.cxx

@@ -1198,7 +1198,7 @@ OUString ToggleUnicodeCodepoint::StringToReplace()
     //if U+ notation used, strip off all extra chars added not in U+ notation
     if( nUPlus != -1 )
     {
-        maInput = maInput.copy(nUPlus);
+        maInput.remove(0, nUPlus);
         sIn = maInput.copy(2).toString();
         nUPlus = sIn.indexOf("U+");
     }

shell/source/backends/desktopbe/desktopbackend.cxx

@@ -198,7 +198,7 @@ OUString xdg_user_dir_lookup (const char *type)
                 continue;
             if (relative)
             {
-                aUserDirBuf = OUStringBuffer(aHomeDirURL + "/");
+                aUserDirBuf = aHomeDirURL + "/";
             }
             else
             {

vcl/source/control/field2.cxx

@@ -1963,8 +1963,11 @@ static bool ImplIsValidTimePortion( bool _bSkipInvalidCharacters, const OUString
 static bool ImplCutTimePortion( OUStringBuffer& _rStr, sal_Int32 _nSepPos, bool _bSkipInvalidCharacters, short* _pPortion )
 {
     OUString sPortion(_rStr.getStr(), _nSepPos );
-    _rStr = _nSepPos < _rStr.getLength()
-        ? _rStr.copy( _nSepPos + 1 ) : OUStringBuffer();
+
+    if (_nSepPos < _rStr.getLength())
+        _rStr = _rStr.copy(_nSepPos + 1);
+    else
+        _rStr.truncate();
 
     if ( !ImplIsValidTimePortion( _bSkipInvalidCharacters, sPortion ) )
         return false;

vcl/source/outdev/text.cxx

@@ -1962,7 +1962,7 @@ OUString OutputDevice::ImplGetEllipsisString( const OutputDevice& rTargetDevice,
             sal_Int32 nEraseChars = std::max<sal_Int32>(4, aStr.getLength() - (nIndex*4)/3);
             while( nEraseChars < aStr.getLength() && _rLayout.GetTextWidth( aTmpStr.toString(), 0, aTmpStr.getLength() ) > nMaxWidth )
             {
-                aTmpStr = OUStringBuffer(aStr);
+                aTmpStr = aStr;
                 sal_Int32 i = (aTmpStr.getLength() - nEraseChars)/2;
                 aTmpStr.remove(i, nEraseChars++);
                 aTmpStr.insert(i, "...");