Light classes: Fix getTextOffset() and getTextRange() for property accessors

Before this commit, getTextOffset() and getTextRange() coming from the super class, returned numbers for the property, not for its accessor. This commit fixes the inconsistency.

idea/tests/org/jetbrains/kotlin/idea/lightClasses/LightClassBehaviorTest.kt

@@ -7,8 +7,10 @@ package org.jetbrains.kotlin.idea.lightClasses
 
 import com.intellij.psi.PsiMethod
 import com.intellij.testFramework.LightProjectDescriptor
+import org.jetbrains.kotlin.asJava.classes.KtLightClass
 import org.jetbrains.kotlin.idea.test.KotlinLightCodeInsightFixtureTestCase
 import org.jetbrains.kotlin.idea.test.KotlinWithJdkAndRuntimeLightProjectDescriptor
+import org.jetbrains.kotlin.psi.KtProperty
 import org.jetbrains.kotlin.test.JUnit3WithIdeaConfigurationRunner
 import org.junit.runner.RunWith
 
@@ -33,6 +35,35 @@ class LightClassBehaviorTest : KotlinLightCodeInsightFixtureTestCase() {
         assert(offset == range.startOffset)
     }
 
+    fun testPropertyAccessorOffsets() {
+        myFixture.configureByText(
+            "test.kt", """
+            class A {
+                var a: Int
+                    get() = 5
+                    set(v) {}
+            }
+            """.trimIndent()
+        )
+
+        val aClass = myFixture.javaFacade.findClass("A") as KtLightClass
+        val getAMethod = aClass.findMethodsByName("getA").single() as PsiMethod
+        val setAMethod = aClass.findMethodsByName("setA").single() as PsiMethod
+
+        val ktClass = aClass.kotlinOrigin!!
+        val ktProperty = ktClass.declarations.filterIsInstance<KtProperty>().single()
+
+        assert(getAMethod.textOffset != setAMethod.textOffset)
+
+        assert(getAMethod.textOffset > 0)
+        assert(getAMethod.textOffset != ktProperty.textOffset)
+        assert(getAMethod.textOffset == getAMethod.textRange.startOffset)
+
+        assert(setAMethod.textOffset > 0)
+        assert(setAMethod.textOffset != ktProperty.textOffset)
+        assert(setAMethod.textOffset == setAMethod.textRange.startOffset)
+    }
+
     override fun getProjectDescriptor(): LightProjectDescriptor {
         return KotlinWithJdkAndRuntimeLightProjectDescriptor.INSTANCE
     }