Fix keyword completion in 'if' blocks

#KT-17914 fixed

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/KeywordCompletion.kt

@@ -217,7 +217,7 @@ object KeywordCompletion {
                         }
 
                         if (prevLeaf?.getParentOfType<KtIfExpression>(strict = false) != null) {
-                            prefixText += "if(true){}"
+                            prefixText += "if(true){}\n"
                         }
 
                         return buildFilterWithContext(prefixText, prevParent, position)

idea/idea-completion/testData/keywords/AfterIf.kt

@@ -0,0 +1,35 @@
+fun some() {
+
+    if (true) {
+
+    } else {
+
+    }
+
+    <caret>
+}
+
+
+// EXIST: do
+// EXIST: as
+// EXIST: class
+// EXIST: else
+// EXIST: false
+// EXIST: for
+// EXIST: fun
+// EXIST: if
+// EXIST: interface
+// EXIST: null
+// EXIST: object
+// EXIST: return
+// EXIST: super
+// EXIST: throw
+// EXIST: true
+// EXIST: try
+// EXIST: typealias
+// EXIST: val
+// EXIST: var
+// EXIST: when
+// EXIST: while
+
+// NOTHING_ELSE

idea/idea-completion/testData/keywords/InElse.kt

@@ -0,0 +1,34 @@
+fun some() {
+
+    if (true) {
+
+    } else {
+        <caret>
+    }
+
+}
+
+
+// EXIST: do
+// EXIST: as
+// EXIST: class
+// EXIST: else
+// EXIST: false
+// EXIST: for
+// EXIST: fun
+// EXIST: if
+// EXIST: interface
+// EXIST: null
+// EXIST: object
+// EXIST: return
+// EXIST: super
+// EXIST: throw
+// EXIST: true
+// EXIST: try
+// EXIST: typealias
+// EXIST: val
+// EXIST: var
+// EXIST: when
+// EXIST: while
+
+// NOTHING_ELSE

idea/idea-completion/testData/keywords/InIf.kt

@@ -0,0 +1,34 @@
+fun some() {
+
+    if (true) {
+        <caret>
+    } else {
+
+    }
+
+}
+
+
+// EXIST: do
+// EXIST: as
+// EXIST: class
+// EXIST: else
+// EXIST: false
+// EXIST: for
+// EXIST: fun
+// EXIST: if
+// EXIST: interface
+// EXIST: null
+// EXIST: object
+// EXIST: return
+// EXIST: super
+// EXIST: throw
+// EXIST: true
+// EXIST: try
+// EXIST: typealias
+// EXIST: val
+// EXIST: var
+// EXIST: when
+// EXIST: while
+
+// NOTHING_ELSE

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/KeywordCompletionTestGenerated.java

@@ -62,6 +62,12 @@ public class KeywordCompletionTestGenerated extends AbstractKeywordCompletionTes
         doTest(fileName);
     }
 
+    @TestMetadata("AfterIf.kt")
+    public void testAfterIf() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/AfterIf.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("AfterSafeDot.kt")
     public void testAfterSafeDot() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/AfterSafeDot.kt");
@@ -228,6 +234,12 @@ public class KeywordCompletionTestGenerated extends AbstractKeywordCompletionTes
         doTest(fileName);
     }
 
+    @TestMetadata("InElse.kt")
+    public void testInElse() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/InElse.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("InEnumScope1.kt")
     public void testInEnumScope1() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/InEnumScope1.kt");
@@ -270,6 +282,12 @@ public class KeywordCompletionTestGenerated extends AbstractKeywordCompletionTes
         doTest(fileName);
     }
 
+    @TestMetadata("InIf.kt")
+    public void testInIf() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/InIf.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("InInterfaceScope.kt")
     public void testInInterfaceScope() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/InInterfaceScope.kt");