Issue #18988: The "Tab" key now works when a word is already autocompleted.
diff --git a/Lib/idlelib/AutoComplete.py b/Lib/idlelib/AutoComplete.py
index 4e17325..cb38691 100644
--- a/Lib/idlelib/AutoComplete.py
+++ b/Lib/idlelib/AutoComplete.py
@@ -156,12 +156,9 @@
         if not comp_lists[0]:
             return
         self.autocompletewindow = self._make_autocomplete_window()
-        self.autocompletewindow.show_window(comp_lists,
-                                            "insert-%dc" % len(comp_start),
-                                            complete,
-                                            mode,
-                                            userWantsWin)
-        return True
+        return not self.autocompletewindow.show_window(
+                comp_lists, "insert-%dc" % len(comp_start),
+                complete, mode, userWantsWin)
 
     def fetch_completions(self, what, mode):
         """Return a pair of lists of completions for something. The first list