remove LookupImpl.clear which even Rider seems not to need (IDEA-CR-60922)

GitOrigin-RevId: 162ea2d960fa6dd50d554f6133652318011745d8

platform/analysis-impl/src/com/intellij/codeInsight/completion/BaseCompletionLookupArranger.kt

@@ -165,9 +165,6 @@ open class BaseCompletionLookupArranger(@JvmField protected val myProcess: Compl
     trimToLimit(createContext())
   }
 
-  @Synchronized
-  override fun clear() = super.clear()
-
   @Synchronized
   override fun itemPattern(element: LookupElement): String = super.itemPattern(element)
 

platform/analysis-impl/src/com/intellij/codeInsight/lookup/LookupArranger.java

@@ -30,13 +30,6 @@ public abstract class LookupArranger implements WeighingContext {
     updateCache(item);
   }
 
-  public void clear() {
-    myItems.clear();
-    myMatchingItems.clear();
-    myExactPrefixItems.clear();
-    myInexactPrefixItems.clear();
-  }
-
   private void updateCache(LookupElement item) {
     if (!prefixMatches(item)) {
       return;

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

@@ -276,10 +276,6 @@ public class LookupImpl extends LightweightHint implements LookupEx, Disposable,
     return true;
   }
 
-  public void clear() {
-    myArranger.clear();
-  }
-
   private void addDummyItems(int count) {
     EmptyLookupItem dummy = new EmptyLookupItem("loading...", true);
     for (int i = count; i > 0; i--) {