tdf#131273: fix crash when pasting quotes with fixed width

See bt https://bugs.documentfoundation.org/show_bug.cgi?id=131273#c2

Change-Id: I78f592bb2ee59b50e7301fe4e6f282e53c4eeb7e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/90438
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
(cherry picked from commit cf3fec9e7cadd0a6c4f42a4015df429d9e32b7e8)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/90398
Reviewed-by: Xisco FaulĂ­ <xiscofauli@libreoffice.org>
diff --git a/sc/source/ui/docshell/impex.cxx b/sc/source/ui/docshell/impex.cxx
index 1f3e733..0e03fdd 100644
--- a/sc/source/ui/docshell/impex.cxx
+++ b/sc/source/ui/docshell/impex.cxx
@@ -1264,7 +1264,7 @@ static OUString lcl_GetFixed( const OUString& rLine, sal_Int32 nStart, sal_Int32
        bool bFits = (nSpace - nStart - 3 <= SAL_MAX_UINT16);
        OSL_ENSURE( bFits, "lcl_GetFixed: line doesn't fit into data");
        if (bFits)
            return rLine.copy(nStart+1, nSpace-nStart-2);
            return rLine.copy(nStart+1, std::max< sal_Int32 >(0, nSpace-nStart-2));
        else
        {
            rbOverflowCell = true;