RxFPC:TZeosDataSetSortEngine - use IsValidIdent

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@4597 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/rx/trunk/exsortzeos.pas

@@ -54,8 +54,9 @@ uses ZDbcIntfs, ZVariant;
 
 function FixFieldName(S:string):string;inline;
 begin
-  if Pos(' ', S)>0 then
-    S:='"'+S+'"';
+  if not IsValidIdent(S) then
+    Result:='"'+S+'"'
+  else
     Result:=S;
 end;