Property accessor isn't recursive when called on another object

So #KT-18120 Fixed

idea/src/org/jetbrains/kotlin/idea/inspections/RecursivePropertyAccessorInspection.kt

@@ -20,6 +20,8 @@ import com.intellij.codeInspection.*
 import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiElementVisitor
 import com.intellij.psi.util.PsiTreeUtil
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
@@ -96,6 +98,9 @@ class RecursivePropertyAccessorInspection : AbstractKotlinInspection() {
             val bindingContext = element.analyze()
             val target = bindingContext[REFERENCE_TARGET, element]
             if (target != bindingContext[BindingContext.DECLARATION_TO_DESCRIPTOR, propertyAccessor.property]) return false
+            (element.parent as? KtQualifiedExpression)?.let {
+                if (it.receiverExpression.text != KtTokens.THIS_KEYWORD.value && !it.hasObjectReceiver(bindingContext)) return false
+            }
             return isSameAccessor(element, propertyAccessor.isGetter)
         }
 
@@ -114,5 +119,10 @@ class RecursivePropertyAccessorInspection : AbstractKotlinInspection() {
                 namedFunctionDescriptor != syntheticDescriptor.setMethod) return false
             return isSameAccessor(element, isGetter)
         }
+
+        private fun KtQualifiedExpression.hasObjectReceiver(context: BindingContext) : Boolean {
+            val receiver = receiverExpression as? KtReferenceExpression ?: return false
+            return (context[REFERENCE_TARGET, receiver] as? ClassDescriptor)?.kind == ClassKind.OBJECT
+        }
     }
 }

idea/testData/inspections/recursivePropertyAccessor/inspectionData/expected.xml

@@ -116,4 +116,13 @@
         <description>Recursive property accessor</description>
     </problem>
 
+    <problem>
+        <file>recursivePropertyAccessors.kt</file>
+        <line>45</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/recursivePropertyAccessors.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Recursive property accessor</problem_class>
+        <description>Recursive property accessor</description>
+    </problem>
+
 </problems>

idea/testData/inspections/recursivePropertyAccessor/recursivePropertyAccessors.kt

@@ -39,3 +39,13 @@ class A {
             }
     }
 }
+
+object Obj {
+    val s: String
+        get() = Obj.s
+}
+
+class Node(val next: Node?) {
+    val last: Node
+        get() = if (next != null) next.last else this
+}