select first item when pressing down on a completely non-focused lookup (IDEA-101043)

platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupActionHandler.java

@@ -85,9 +85,13 @@ public abstract class LookupActionHandler extends EditorActionHandler {
 
     static void executeDown(LookupImpl lookup) {
       if (!lookup.isFocused()) {
+        boolean semiFocused = CompletionPreview.hasPreview(lookup);
         lookup.setFocused(true);
         lookup.getList().setSelectedIndex(0);
         lookup.refreshUi(false, true);
+        if (!semiFocused) {
+          return;
+        }
       }
       ListScrollingUtil.moveDown(lookup.getList(), 0);
     }