tweak dropdown position. fixes select2#228

Author: ivaynberg

select2.js

@@ -828,8 +828,10 @@
 
             this.dropdown.show();
             this.ensureHighlightVisible();
-            this.focusSearch();
 
+            this.positionDropdown();
+
+            this.focusSearch();
         },
 
         // abstract
@@ -997,7 +999,7 @@
             function postRender() {
                 results.scrollTop(0);
                 search.removeClass("select2-active");
-                self.positionDropdown();
+                if (initial !== true) self.positionDropdown();
             }
 
             function render(html) {
@@ -1010,9 +1012,6 @@
                 return;
             }
 
-            // position dropdown before making a potentially long request
-            this.positionDropdown();
-
             this.resultsPage = 1;
             opts.query({
                     term: search.val(),