don't restart completion after typing 2 characters: it's not needed with current matching

java/java-tests/testData/codeInsight/completion/normal/SecondInvocationToFillCommonPrefix.java

@@ -1,13 +0,0 @@
-public class TestCase extends Zzz {
-	{
-        int fai1;
-        int fai2;
-        int fai3;
-        f<caret>
-
-	}
-}
-
-class Zzz {
-    private void fax() {}
-}

java/java-tests/testData/codeInsight/completion/normal/SecondInvocationToFillCommonPrefix_after.java

@@ -1,13 +0,0 @@
-public class TestCase extends Zzz {
-	{
-        int fai1;
-        int fai2;
-        int fai3;
-        fai<caret>
-
-	}
-}
-
-class Zzz {
-    private void fax() {}
-}

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

@@ -847,14 +847,6 @@ public class ListUtils {
     checkResultByFile(getTestName(false) + "_after.java")
   }
 
-  public void testSecondInvocationToFillCommonPrefix() throws Throwable {
-    configure()
-    type('a');
-    complete();
-    assertStringItems("fai1", "fai2", "fai3");
-    checkResult()
-  }
-
   public void testSuggestInaccessibleOnSecondInvocation() throws Throwable {
     configure()
     assertStringItems("_bar", "_goo");

platform/lang-impl/src/com/intellij/codeInsight/completion/CompletionProgressIndicator.java

@@ -54,7 +54,6 @@ import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.util.registry.Registry;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.patterns.ElementPattern;
-import com.intellij.patterns.StandardPatterns;
 import com.intellij.psi.PsiFile;
 import com.intellij.psi.PsiReference;
 import com.intellij.psi.ReferenceRange;
@@ -371,9 +370,6 @@ public class CompletionProgressIndicator extends ProgressIndicatorBase implement
     myCount++;
 
     if (myCount == 1) {
-      // real middle matching variants are added only with prefix of length >=2
-      addWatchedPrefix(myParameters.getOffset() - item.getPrefixMatcher().getPrefix().length(), StandardPatterns.string().withLength(2));
-
       new Alarm(Alarm.ThreadToUse.SHARED_THREAD, this).addRequest(new Runnable() {
         @Override
         public void run() {