Code completion: fixed comma key behavior for function with parameters + more tests

idea/testData/completion/handlers/charFilter/CommaForFunction1.kt

@@ -0,0 +1,8 @@
+fun foo() {}
+
+fun bar() {
+    x(<caret>)
+}
+
+// ELEMENT: foo
+// CHAR: ','

idea/testData/completion/handlers/charFilter/CommaForFunction1.kt.after

@@ -0,0 +1,8 @@
+fun foo() {}
+
+fun bar() {
+    x(foo(), <caret>)
+}
+
+// ELEMENT: foo
+// CHAR: ','

idea/testData/completion/handlers/charFilter/CommaForFunction2.kt

@@ -0,0 +1,8 @@
+fun foo(p: Int) {}
+
+fun bar() {
+    x(<caret>)
+}
+
+// ELEMENT: foo
+// CHAR: ','

idea/testData/completion/handlers/charFilter/CommaForFunction2.kt.after

@@ -0,0 +1,8 @@
+fun foo(p: Int) {}
+
+fun bar() {
+    x(foo(), <caret>)
+}
+
+// ELEMENT: foo
+// CHAR: ','

idea/testData/completion/handlers/charFilter/DotAfterFun1.kt

@@ -0,0 +1,8 @@
+fun foo(): String = ""
+
+fun bar() {
+    <caret>
+}
+
+// ELEMENT: foo
+// CHAR: .

idea/testData/completion/handlers/charFilter/DotAfterFun1.kt.after

@@ -0,0 +1,8 @@
+fun foo(): String = ""
+
+fun bar() {
+    foo().<caret>
+}
+
+// ELEMENT: foo
+// CHAR: .

idea/testData/completion/handlers/charFilter/DotAfterFun2.kt

@@ -0,0 +1,8 @@
+fun foo(p: Int): String = ""
+
+fun bar() {
+    <caret>
+}
+
+// ELEMENT: foo
+// CHAR: .

idea/testData/completion/handlers/charFilter/DotAfterFun2.kt.after

@@ -0,0 +1,8 @@
+fun foo(p: Int): String = ""
+
+fun bar() {
+    foo().<caret>
+}
+
+// ELEMENT: foo
+// CHAR: .