Force ISO date format again if ISO input, tdf#91758 follow-up

... and input doesn't match a date acceptance pattern, even if less than 3
digits in year.

Change-Id: Ib25aa8e813c06a224cfa95ead79c0f3bf2d2d672

svl/source/numbers/zforfind.cxx

@@ -1047,6 +1047,13 @@ bool ImpSvNumberInputScan::CanForceToIso8601( DateOrder eDateOrder )
     }
     else
     {
+        if (eDateOrder == DateOrder::Invalid)
+        {
+            // As if any of the cases below can be applied, but only if a
+            // locale dependent date pattern was not matched.
+            return (GetDatePatternNumbers() != nNumericsCnt) || !IsDatePatternNumberOfType(0,'Y');
+        }
+
         nCanForceToIso8601 = 1;
     }
 

svl/source/numbers/zforlist.cxx

@@ -1097,7 +1097,7 @@ bool SvNumberFormatter::IsNumberFormat(const OUString& sString,
         {
         case css::util::NumberFormat::DATE :
             // Preserve ISO 8601 input.
-            if (pStringScanner->CanForceToIso8601( DateOrder::DMY))
+            if (pStringScanner->CanForceToIso8601( DateOrder::Invalid))
             {
                 F_Index = GetFormatIndex( NF_DATE_DIN_YYYYMMDD, ActLnge );
             }