Fix wrong unnecessary completion for the case of force completion

#KT-1187 Fixed

idea/src/org/jetbrains/jet/plugin/caches/JetShortNamesCache.java

@@ -45,6 +45,7 @@ import org.jetbrains.jet.lang.resolve.lazy.ResolveSessionUtils;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
+import org.jetbrains.jet.lang.types.ErrorUtils;
 import org.jetbrains.jet.lang.types.JetType;
 import org.jetbrains.jet.lang.types.expressions.ExpressionTypingUtils;
 import org.jetbrains.jet.plugin.caches.resolve.IDELightClassGenerationSupport;
@@ -308,7 +309,7 @@ public class JetShortNamesCache extends PsiShortNamesCache {
             JetType expressionType = context.get(BindingContext.EXPRESSION_TYPE, receiverExpression);
             JetScope scope = context.get(BindingContext.RESOLUTION_SCOPE, receiverExpression);
 
-            if (expressionType != null && scope != null) {
+            if (expressionType != null && scope != null && !ErrorUtils.isErrorType(expressionType)) {
                 Collection<String> extensionFunctionsNames = getAllJetExtensionFunctionsNames(searchScope);
 
                 Set<FqName> functionFQNs = new java.util.HashSet<FqName>();

idea/testData/completion/basic/common/DoNotCompleteForErrorReceivers.kt

@@ -4,4 +4,5 @@ fun anyfun() {
     a.b.c.d.e.f.<caret>
 }
 
+// TIME: 1
 // NUMBER: 0

idea/testData/completion/basic/common/DoNotCompleteForErrorReceiversForce.kt

@@ -0,0 +1,8 @@
+/// KT-1187 Wrong unnecessary completion
+
+fun anyfun() {
+    a.b.c.d.e.f.<caret>
+}
+
+// TIME: 2
+// NUMBER: 0

idea/tests/org/jetbrains/jet/completion/JetBasicJSCompletionTestGenerated.java

@@ -104,6 +104,11 @@ public class JetBasicJSCompletionTestGenerated extends AbstractJetJSCompletionTe
             doTest("idea/testData/completion/basic/common/DoNotCompleteForErrorReceivers.kt");
         }
         
+        @TestMetadata("DoNotCompleteForErrorReceiversForce.kt")
+        public void testDoNotCompleteForErrorReceiversForce() throws Exception {
+            doTest("idea/testData/completion/basic/common/DoNotCompleteForErrorReceiversForce.kt");
+        }
+        
         @TestMetadata("ExtendClassName.kt")
         public void testExtendClassName() throws Exception {
             doTest("idea/testData/completion/basic/common/ExtendClassName.kt");

idea/tests/org/jetbrains/jet/completion/JetBasicJavaCompletionTestGenerated.java

@@ -104,6 +104,11 @@ public class JetBasicJavaCompletionTestGenerated extends AbstractJavaCompletionT
             doTest("idea/testData/completion/basic/common/DoNotCompleteForErrorReceivers.kt");
         }
         
+        @TestMetadata("DoNotCompleteForErrorReceiversForce.kt")
+        public void testDoNotCompleteForErrorReceiversForce() throws Exception {
+            doTest("idea/testData/completion/basic/common/DoNotCompleteForErrorReceiversForce.kt");
+        }
+        
         @TestMetadata("ExtendClassName.kt")
         public void testExtendClassName() throws Exception {
             doTest("idea/testData/completion/basic/common/ExtendClassName.kt");