Code completion: changed dummy identifier for basic completion to ignore context ahead + no invisible symbols on first completion even if nothing matches

idea/testData/completion/basic/common/namedParameters/NotOnlyNamedParameters.kt

@@ -5,5 +5,5 @@ fun test(p: Int) = foo(12, <caret>, third = "")
 
 // EXIST: p
 // ABSENT: first
-// ABSENT: third
+// EXIST: third
 // EXIST: second

idea/testData/completion/basic/common/namedParameters/NotOnlyNamedParameters2.kt

@@ -0,0 +1,9 @@
+fun foo(first: Int, second: Int, third: String) {
+}
+
+fun test(p: Int) = foo(<caret>second = 3)
+
+// EXIST: p
+// EXIST: first
+// EXIST: second
+// EXIST: third

idea/testData/completion/basic/common/namedParameters/OnlyNamedParameters.kt

@@ -7,3 +7,4 @@ fun test(p: Int) = foo(12, third = "", <caret>)
 // ABSENT: first
 // ABSENT: third
 // EXIST: second
+// NUMBER: 1

idea/testData/completion/basic/common/namedParameters/WithParameterExpression.kt

@@ -7,6 +7,6 @@ fun test() = small(param<caret>First = 12)
 
 // EXIST: paramFirst
 // EXIST: paramSecond
-// ABSENT: paramTest
+// EXIST: paramTest
 
-// NUMBER: 2
+// NUMBER: 3