IDEA-89059 Selected item is scrolled off the bottom of the code completion popup

platform/lang-impl/src/com/intellij/codeInsight/completion/CompletionProgressIndicator.java

@@ -356,7 +356,7 @@ public class CompletionProgressIndicator extends ProgressIndicatorBase implement
       }
       justShown = true;
     }
-    myLookup.refreshUi(true, false);
+    myLookup.refreshUi(true, justShown);
     hideAutopopupIfMeaningless();
     if (justShown) {
       myLookup.ensureSelectionVisible();

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

@@ -472,6 +472,9 @@ public class LookupImpl extends LightweightHint implements LookupEx, Disposable
       updateListHeight(listModel);
 
       myList.setSelectedIndex(toSelect);
+      if (onExplicitAction && myShown) {
+        myList.ensureIndexIsVisible(toSelect);
+      }
       return !oldModel.equals(items);
     }
 
@@ -1301,8 +1304,10 @@ public class LookupImpl extends LightweightHint implements LookupEx, Disposable
       public void run() {
         if (!myDisposed) {
           myAdComponent.addAdvertisement(text);
-          requestResize();
-          refreshUi(false, false);
+          if (myShown) {
+            requestResize();
+            refreshUi(false, false);
+          }
         }
       }
     });