KT-2859 Inconsistency before reparse upon completing by Tab key

#KT-2859 fixed

idea/src/org/jetbrains/jet/plugin/codeInsight/ReferenceToClassesShortening.java

@@ -16,6 +16,7 @@
 
 package org.jetbrains.jet.plugin.codeInsight;
 
+import com.intellij.psi.PsiDocumentManager;
 import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
 import org.jetbrains.jet.lang.descriptors.ClassifierDescriptor;
 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
@@ -37,6 +38,8 @@ public class ReferenceToClassesShortening {
         if (elementsToCompact.isEmpty()) {
             return;
         }
+        PsiDocumentManager.getInstance(elementsToCompact.get(0).getProject()).commitAllDocuments();
+
         final JetFile file = (JetFile) elementsToCompact.get(0).getContainingFile();
         final BindingContext bc = WholeProjectAnalyzerFacade.analyzeProjectWithCacheOnAFile(file).getBindingContext();
         for (JetElement element : elementsToCompact) {

idea/src/org/jetbrains/jet/plugin/completion/handlers/JetClassInsertHandler.java

@@ -20,6 +20,7 @@ import com.intellij.codeInsight.completion.InsertHandler;
 import com.intellij.codeInsight.completion.InsertionContext;
 import com.intellij.codeInsight.lookup.LookupElement;
 import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.psi.PsiDocumentManager;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
 import org.jetbrains.jet.lang.psi.JetFile;
@@ -38,6 +39,8 @@ public class JetClassInsertHandler implements InsertHandler<LookupElement> {
 
     @Override
     public void handleInsert(final InsertionContext context, final LookupElement item) {
+        PsiDocumentManager.getInstance(context.getProject()).commitAllDocuments();
+
         if (context.getFile() instanceof JetFile) {
             final JetFile jetFile = (JetFile) context.getFile();
             ApplicationManager.getApplication().runReadAction(new Runnable() {

idea/src/org/jetbrains/jet/plugin/completion/handlers/JetFunctionInsertHandler.java

@@ -67,6 +67,8 @@ public class JetFunctionInsertHandler implements InsertHandler<LookupElement> {
 
     @Override
     public void handleInsert(InsertionContext context, LookupElement item) {
+        PsiDocumentManager.getInstance(context.getProject()).commitAllDocuments();
+
         if (context.getCompletionChar() == '(') {
             context.setAddCompletionChar(false);
         }

idea/src/org/jetbrains/jet/plugin/completion/handlers/JetJavaClassInsertHandler.java

@@ -19,6 +19,7 @@ package org.jetbrains.jet.plugin.completion.handlers;
 import com.intellij.codeInsight.completion.InsertHandler;
 import com.intellij.codeInsight.completion.InsertionContext;
 import com.intellij.codeInsight.completion.JavaPsiClassReferenceElement;
+import com.intellij.psi.PsiDocumentManager;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.plugin.quickfix.ImportInsertHelper;
@@ -34,6 +35,8 @@ public class JetJavaClassInsertHandler implements InsertHandler<JavaPsiClassRefe
 
     @Override
     public void handleInsert(final InsertionContext context, final JavaPsiClassReferenceElement item) {
+        PsiDocumentManager.getInstance(context.getProject()).commitAllDocuments();
+
         if (context.getFile() instanceof JetFile) {
             ImportInsertHelper.addImportDirectiveOrChangeToFqName(new FqName(item.getQualifiedName()),
                                                                   (JetFile) context.getFile(),

idea/testData/completion/handlers/InsertImportOnTab.kt

@@ -0,0 +1 @@
+val s = Ar<caret>List()

idea/testData/completion/handlers/InsertImportOnTab.kt.after

@@ -0,0 +1,3 @@
+import java.util.ArrayList
+
+val s = ArrayList()

idea/tests/org/jetbrains/jet/completion/handlers/CompletionHandlerTest.java

@@ -83,6 +83,10 @@ public class CompletionHandlerTest extends LightCompletionTestCase {
         doTest(' ');
     }
 
+    public void testInsertImportOnTab() {
+        doTest(CompletionType.BASIC, 2, "ArrayList", null, '\t');
+    }
+
     public void testFunctionLiteralInsertWhenNoSpacesForBraces() {
         CodeStyleSettings settings = CodeStyleSettingsManager.getSettings(getProject());
         JetCodeStyleSettings jetSettings = settings.getCustomSettings(JetCodeStyleSettings.class);