Fix merge affixes for numeric ones

Some dictionaries have duplicated base words with different affix set, we
just merge that sets into one set. But previously merging of sets of affixes
was actually a concatenation of strings but it's wrong for numeric
representation of affixes because such representation uses comma to
separate affixes.

Author: Artur Zakirov

src/backend/tsearch/spell.c

@@ -1465,6 +1465,12 @@ MergeAffix(IspellDict *Conf, int a1, int a2)
 {
 	char	  **ptr;
 
+	/* Do not merge affix flags if one of affix flags is empty */
+	if (*Conf->AffixData[a1] == '\0')
+		return a2;
+	else if (*Conf->AffixData[a2] == '\0')
+		return a1;
+
 	while (Conf->nAffixData + 1 >= Conf->lenAffixData)
 	{
 		Conf->lenAffixData *= 2;
@@ -1473,10 +1479,20 @@ MergeAffix(IspellDict *Conf, int a1, int a2)
 	}
 
 	ptr = Conf->AffixData + Conf->nAffixData;
-	*ptr = cpalloc(strlen(Conf->AffixData[a1]) +
-				   strlen(Conf->AffixData[a2]) +
-				   1 /* space */ + 1 /* \0 */ );
-	sprintf(*ptr, "%s %s", Conf->AffixData[a1], Conf->AffixData[a2]);
+	if (Conf->flagMode == FM_NUM)
+	{
+		*ptr = cpalloc(strlen(Conf->AffixData[a1]) +
+					   strlen(Conf->AffixData[a2]) +
+					   1 /* comma */ + 1 /* \0 */ );
+		sprintf(*ptr, "%s,%s", Conf->AffixData[a1], Conf->AffixData[a2]);
+	}
+	else
+	{
+		*ptr = cpalloc(strlen(Conf->AffixData[a1]) +
+					   strlen(Conf->AffixData[a2]) +
+					   1 /* \0 */ );
+		sprintf(*ptr, "%s%s", Conf->AffixData[a1], Conf->AffixData[a2]);
+	}
 	ptr++;
 	*ptr = NULL;
 	Conf->nAffixData++;