when lexicographic completion sorting is enabled, really sort the items lexicographically, without all the priority/grouping/etc stuff (IDEA-79651)

java/java-tests/testData/codeInsight/completion/normalSorting/ReallyAlphaSorting.java

@@ -0,0 +1,8 @@
+class Foo {
+  void zoo() {}
+
+  {
+    new Foo().<caret>
+  }
+
+}