Smart completion: more correct Tab key handling

#KT-4954 Fixed

idea/testData/completion/handlers/smart/DoNotEraseBraceOnTab.kt

@@ -0,0 +1,8 @@
+package sample
+
+fun foo(s: String){
+    val s1: String = <caret>
+}
+
+//ELEMENT: s
+//CHAR: \t

idea/testData/completion/handlers/smart/DoNotEraseBraceOnTab.kt.after

@@ -0,0 +1,8 @@
+package sample
+
+fun foo(s: String){
+    val s1: String = s<caret>
+}
+
+//ELEMENT: s
+//CHAR: \t

idea/testData/completion/handlers/smart/DoNotReplaceOnEnter.kt

@@ -0,0 +1,7 @@
+fun foo(p: Int): Int = p
+
+fun f(p: Int): Int {
+    return <caret>foo(1)
+}
+
+//ELEMENT: p

idea/testData/completion/handlers/smart/DoNotReplaceOnEnter.kt.after

@@ -0,0 +1,7 @@
+fun foo(p: Int): Int = p
+
+fun f(p: Int): Int {
+    return p<caret>foo(1)
+}
+
+//ELEMENT: p

idea/testData/completion/handlers/smart/NullableValueKeepOldArguments.kt

@@ -0,0 +1,10 @@
+fun foo(s: String, c: Char){ }
+
+fun takeString(p: Int): String? = null
+
+fun bar() {
+    foo(<caret>qqq(1, 2, 3))
+}
+
+// ELEMENT_TEXT: "!! takeString"
+// CHAR: \t

idea/testData/completion/handlers/smart/NullableValueKeepOldArguments.kt.after

@@ -0,0 +1,10 @@
+fun foo(s: String, c: Char){ }
+
+fun takeString(p: Int): String? = null
+
+fun bar() {
+    foo(takeString(<caret>1, 2, 3)!!, )
+}
+
+// ELEMENT_TEXT: "!! takeString"
+// CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceExpression4.kt

@@ -0,0 +1,8 @@
+fun foo(s: String){ }
+
+fun bar(sss: String) {
+    foo(<caret>x())
+}
+
+//ELEMENT: sss
+//CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceExpression4.kt.after

@@ -0,0 +1,8 @@
+fun foo(s: String){ }
+
+fun bar(sss: String) {
+    foo(sss)<caret>
+}
+
+//ELEMENT: sss
+//CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceFunctionName1.kt

@@ -0,0 +1,9 @@
+fun foo(p: Int): Int = p
+fun bar(p: Int): Int = p
+
+fun f(): Int {
+    return <caret>foo(1)
+}
+
+//ELEMENT: bar
+//CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceFunctionName1.kt.after

@@ -0,0 +1,9 @@
+fun foo(p: Int): Int = p
+fun bar(p: Int): Int = p
+
+fun f(): Int {
+    return bar(<caret>1)
+}
+
+//ELEMENT: bar
+//CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceFunctionName2.kt

@@ -0,0 +1,9 @@
+fun foo(p: Int): Int = p
+fun bar(): Int = p
+
+fun f(): Int {
+    return <caret>foo(1)
+}
+
+//ELEMENT: bar
+//CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceFunctionName2.kt.after

@@ -0,0 +1,9 @@
+fun foo(p: Int): Int = p
+fun bar(): Int = p
+
+fun f(): Int {
+    return bar()<caret>
+}
+
+//ELEMENT: bar
+//CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceFunctionName3.kt

@@ -0,0 +1,10 @@
+fun foo(s: String, i: Int){ }
+
+fun takeString(p: Int): String = ""
+
+fun bar() {
+    foo(<caret>x(1))
+}
+
+//ELEMENT: takeString
+//CHAR: \t

idea/testData/completion/handlers/smart/TabReplaceFunctionName3.kt.after

@@ -0,0 +1,10 @@
+fun foo(s: String, i: Int){ }
+
+fun takeString(p: Int): String = ""
+
+fun bar() {
+    foo(takeString(<caret>1), )
+}
+
+//ELEMENT: takeString
+//CHAR: \t