KT-5292 Expand selection should have kdoc + method as a stop point

KT-3947 Extend selection works badly with comment

 #KT-5292 Fixed
 #KT-3947 Fixed

idea/testData/wordSelection/LineComment/0.kt

@@ -0,0 +1,8 @@
+package p
+
+class C{
+    // This is a <caret>val
+    val v = 1
+
+    fun foo(){}
+}

idea/testData/wordSelection/LineComment/1.kt

@@ -0,0 +1,8 @@
+package p
+
+class C{
+    // This is a <selection><caret>val</selection>
+    val v = 1
+
+    fun foo(){}
+}

idea/testData/wordSelection/LineComment/2.kt

@@ -0,0 +1,8 @@
+package p
+
+class C{
+    // <selection>This is a <caret>val</selection>
+    val v = 1
+
+    fun foo(){}
+}

idea/testData/wordSelection/LineComment/3.kt

@@ -0,0 +1,8 @@
+package p
+
+class C{
+    <selection>// This is a <caret>val</selection>
+    val v = 1
+
+    fun foo(){}
+}

idea/testData/wordSelection/LineComment/4.kt

@@ -0,0 +1,8 @@
+package p
+
+class C{
+<selection>    // This is a <caret>val
+</selection>    val v = 1
+
+    fun foo(){}
+}

idea/testData/wordSelection/LineComment/5.kt

@@ -0,0 +1,8 @@
+package p
+
+class C{
+<selection>    // This is a <caret>val
+    val v = 1
+</selection>
+    fun foo(){}
+}