Completion of keywords (like constructor) doesn't insert parentheses/braces if they're already there

#KT-15603 Fixed
 #KT-13524 Fixed

idea/idea-completion/testData/handlers/keywords/ConstructorPrimary.kt

@@ -0,0 +1,5 @@
+class C c<caret>() {
+
+}
+
+// ELEMENT: constructor

idea/idea-completion/testData/handlers/keywords/ConstructorPrimary.kt.after

@@ -0,0 +1,5 @@
+class C constructor(<caret>) {
+
+}
+
+// ELEMENT: constructor

idea/idea-completion/testData/handlers/keywords/IfParansOnNextLine.kt

@@ -0,0 +1,6 @@
+fun other(a: Any) {
+    i<caret>
+    (a as Int).let { println(a + 12) }
+}
+
+// ELEMENT: if

idea/idea-completion/testData/handlers/keywords/IfParansOnNextLine.kt.after

@@ -0,0 +1,6 @@
+fun other(a: Any) {
+    if (<caret>)
+    (a as Int).let { println(a + 12) }
+}
+
+// ELEMENT: if