Navigation: new icons for header <---> impl #KT-15842 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/KotlinIcons.java

@@ -46,6 +46,8 @@ public interface KotlinIcons {
     Icon TYPE_ALIAS = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/typeAlias.png");
 
     Icon SUSPEND_CALL = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/suspendCall.png");
+    Icon FROM_HEADER = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/fromHeader.png");
+    Icon FROM_IMPL = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/fromImpl.png");
 
     Icon LAUNCH = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/kotlin_launch_configuration.png");
 }

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

@@ -32,6 +32,7 @@ import com.intellij.psi.search.searches.ClassInheritorsSearch
 import org.jetbrains.kotlin.asJava.LightClassUtil
 import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.idea.KotlinIcons
 import org.jetbrains.kotlin.idea.caches.resolve.findModuleDescriptor
 import org.jetbrains.kotlin.idea.core.toDescriptor
 import org.jetbrains.kotlin.idea.util.ProjectRootsUtil
@@ -245,7 +246,7 @@ private fun collectImplementationMarkers(declaration: KtNamedDeclaration,
     result.add(LineMarkerInfo(
             anchor,
             anchor.textRange,
-            IMPLEMENTED_MARK,
+            KotlinIcons.FROM_HEADER,
             Pass.UPDATE_OVERRIDDEN_MARKERS,
             PLATFORM_IMPLEMENTATION.tooltip,
             PLATFORM_IMPLEMENTATION.navigationHandler,
@@ -266,7 +267,7 @@ private fun collectHeaderMarkers(declaration: KtNamedDeclaration,
     result.add(LineMarkerInfo(
             anchor,
             anchor.textRange,
-            IMPLEMENTING_MARK,
+            KotlinIcons.FROM_IMPL,
             Pass.UPDATE_OVERRIDDEN_MARKERS,
             HEADER_DECLARATION.tooltip,
             HEADER_DECLARATION.navigationHandler,