IDEA-87943 Wrong default selection in code completion popup when variable name has an underscore prefix

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

@@ -0,0 +1,5 @@
+class FooBar {
+  void foo(FooBar _fooBar) {
+    fb<caret>
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionOrderingTest.groovy

@@ -378,4 +378,9 @@ public class NormalCompletionOrderingTest extends CompletionSortingTestCase {
     assertPreferredItems(0, 'fooy', 'foox', 'fooAClass', 'fooBar');
   }
 
+  public void testUnderscoresDontMakeMatchMiddle() {
+    CodeInsightSettings.getInstance().COMPLETION_CASE_SENSITIVE = CodeInsightSettings.NONE;
+    checkPreferredItems(0, '_fooBar', 'FooBar')
+  }
+
 }