Introduce isExpect/ActualDeclaration in KotlinLineMarkerProvider

Treat every member of expect declaration as expect declaration itself
So #KT-18455 Fixed

idea/src/org/jetbrains/kotlin/idea/highlighter/markers/KotlinLineMarkerProvider.kt

@@ -48,6 +48,7 @@ import org.jetbrains.kotlin.idea.facet.implementingDescriptors
 import org.jetbrains.kotlin.idea.util.ProjectRootsUtil
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.containingClassOrObject
 import org.jetbrains.kotlin.psi.psiUtil.hasExpectModifier
 import org.jetbrains.kotlin.psi.psiUtil.hasActualModifier
 import java.awt.event.MouseEvent
@@ -61,6 +62,12 @@ class KotlinLineMarkerProvider : LineMarkerProvider {
         return null
     }
 
+    private fun KtNamedDeclaration.isExpectDeclaration(): Boolean =
+            hasExpectModifier() || containingClassOrObject?.isExpectDeclaration() == true
+
+    private fun KtNamedDeclaration.isActualDeclaration(): Boolean =
+            hasActualModifier()
+
     override fun collectSlowLineMarkers(elements: List<PsiElement>, result: MutableCollection<LineMarkerInfo<*>>) {
         if (elements.isEmpty()) return
 
@@ -100,10 +107,10 @@ class KotlinLineMarkerProvider : LineMarkerProvider {
         for (element in elements) {
             if (element !is KtNamedDeclaration) continue
 
-            if (element.hasExpectModifier()) {
+            if (element.isExpectDeclaration()) {
                 collectActualMarkers(element, result)
             }
-            else if (element.hasActualModifier()) {
+            else if (element.isActualDeclaration()) {
                 collectExpectedMarkers(element, result)
             }
         }

idea/testData/multiModuleLineMarker/fromCommonToJvmHeader/common/common.kt

@@ -1,5 +1,5 @@
 expect class <lineMarker>Header</lineMarker> {
-    fun foo(): Int
+    fun <lineMarker>foo</lineMarker>(): Int
 }
 
 expect fun <lineMarker>foo</lineMarker>(arg: Int): String

idea/testData/multiModuleLineMarker/fromExpectedSecondaryConstructor/common/common.kt

@@ -1,3 +1,3 @@
 expect class <lineMarker>SecondaryConstructor</lineMarker>{
-    constructor(name: String, surname: String)
+    <lineMarker>constructor</lineMarker>(name: String, surname: String)
 }