don't overwrite dots when finishing completion by ., since it's irritating

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

@@ -0,0 +1,8 @@
+public class JavaClass {
+  Object magic() {}
+  Object magic2() {}
+
+  void foo() {
+    mag<caret>.aaa
+  }
+}

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

@@ -0,0 +1,8 @@
+public class JavaClass {
+  Object magic() {}
+  Object magic2() {}
+
+  void foo() {
+    magic().<caret>.aaa
+  }
+}

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

@@ -881,6 +881,8 @@ public class NormalCompletionTest extends LightFixtureCompletionTestCase {
 
   public void testInstanceMagicMethod() throws Exception { doTest() }
 
+  public void testNoDotOverwrite() throws Exception { doTest('.') }
+
   public void testNoMethodsInParameterType() {
     configure()
     assertOrderedEquals myFixture.lookupElementStrings, "final", "float"

platform/lang-api/src/com/intellij/codeInsight/TailType.java

@@ -93,7 +93,18 @@ public abstract class TailType {
     }
   };
   public static final TailType SPACE = new CharTailType(' ');
-  public static final TailType DOT = new CharTailType('.');
+  public static final TailType DOT = new TailType() {
+    @Override
+    public int processTail(Editor editor, int tailOffset) {
+      editor.getDocument().insertString(tailOffset, ".");
+      return moveCaret(editor, tailOffset, 1);
+    }
+
+    @Override
+    public String toString() {
+      return "DOT";
+    }
+  };
 
   public static final TailType CASE_COLON = new CharTailType(':');
   public static final TailType COND_EXPR_COLON = new TailType(){