make sure that wxNewId() doesn't return standard ID's value

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30302 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/utilscmn.cpp

@@ -547,9 +547,12 @@ bool wxYieldIfNeeded()
 // Id generation
 static long wxCurrentId = 100;
 
-long
+long wxNewId()
-wxNewId (void)
 {
+    // skip the part of IDs space that contains hard-coded values:
+    if (wxCurrentId == wxID_LOWEST)
+        wxCurrentId = wxID_HIGHEST + 1;
+
     return wxCurrentId++;
 }