KT-2128 Code completion after number with dot - no tests for now

#KT-2128 In Progress

idea/src/META-INF/plugin.xml

@@ -144,6 +144,8 @@
 
       <completion.skip implementation="org.jetbrains.jet.plugin.liveTemplates.JetLiveTemplateCompletionContributor$Skipper" id="skipLiveTemplate"/>
 
+      <lookup.charFilter implementation="org.jetbrains.jet.plugin.completion.JetReferenceCharFilter"/>
+
       <psi.referenceContributor language="jet" order="after JetCompletionContributor" implementation="org.jetbrains.jet.plugin.references.JetReferenceContributor"/>
 
       <renamePsiElementProcessor implementation="org.jetbrains.jet.plugin.refactoring.rename.RenameJetClassProcessor"/>

idea/src/org/jetbrains/jet/plugin/completion/JetReferenceCharFilter.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2010-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.plugin.completion;
+
+import com.intellij.codeInsight.completion.CompletionCharFilter;
+import com.intellij.codeInsight.lookup.CharFilter;
+import com.intellij.codeInsight.lookup.Lookup;
+import com.intellij.psi.PsiFile;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.jet.lang.psi.JetFile;
+
+public class JetReferenceCharFilter extends CharFilter {
+    private final static CharFilter delegate = new CompletionCharFilter();
+
+    @Override
+    @Nullable
+    public Result acceptChar(char c, int prefixLength, Lookup lookup) {
+        final PsiFile psiFile = lookup.getPsiFile();
+        if (!(psiFile instanceof JetFile)) {
+            return null;
+        }
+
+        if (c == '.') {
+            return Result.HIDE_LOOKUP;
+        }
+
+        return delegate.acceptChar(c, prefixLength, lookup);
+    }
+}