public void hideLookup(boolean explicitly) {
    ApplicationManager.getApplication().assertIsDispatchThread();

    if (myHidden) return;

    doHide(true, explicitly);
  }
  public void finishLookup(char completionChar, @Nullable final LookupElement item) {
    //noinspection deprecation,unchecked
    if (item == null
        || item instanceof EmptyLookupItem
        || item.getObject() instanceof DeferredUserLookupValue
            && item.as(LookupItem.CLASS_CONDITION_KEY) != null
            && !((DeferredUserLookupValue) item.getObject())
                .handleUserSelection(item.as(LookupItem.CLASS_CONDITION_KEY), myProject)) {
      doHide(false, true);
      fireItemSelected(null, completionChar);
      return;
    }

    if (myDisposed) { // DeferredUserLookupValue could close us in any way
      return;
    }

    final PsiFile file = getPsiFile();
    boolean writableOk =
        file == null || FileModificationService.getInstance().prepareFileForWrite(file);
    if (myDisposed) { // ensureFilesWritable could close us by showing a dialog
      return;
    }

    if (!writableOk) {
      doHide(false, true);
      fireItemSelected(null, completionChar);
      return;
    }

    final String prefix = itemPattern(item);
    boolean plainMatch =
        ContainerUtil.or(
            item.getAllLookupStrings(),
            new Condition<String>() {
              @Override
              public boolean value(String s) {
                return StringUtil.containsIgnoreCase(s, prefix);
              }
            });
    if (!plainMatch) {
      FeatureUsageTracker.getInstance()
          .triggerFeatureUsed(CodeCompletionFeatures.EDITING_COMPLETION_CAMEL_HUMPS);
    }

    myFinishing = true;
    ApplicationManager.getApplication()
        .runWriteAction(
            new Runnable() {
              public void run() {
                myEditor.getDocument().startGuardedBlockChecking();
                try {
                  insertLookupString(item, getPrefixLength(item));
                } finally {
                  myEditor.getDocument().stopGuardedBlockChecking();
                }
              }
            });

    if (myDisposed) { // any document listeners could close us
      return;
    }

    doHide(false, true);

    fireItemSelected(item, completionChar);
  }