Add exit point highlighting for accessors (KT-21318)

#KT-21318 Fixed

idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinHighlightExitPointsHandlerFactory.kt

@@ -29,13 +29,10 @@ import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.references.mainReference
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
-import org.jetbrains.kotlin.psi.psiUtil.getParentOfType
-import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
 import org.jetbrains.kotlin.psi.psiUtil.parents
 import org.jetbrains.kotlin.resolve.inline.InlineUtil
 
-class KotlinHighlightExitPointsHandlerFactory: HighlightUsagesHandlerFactoryBase() {
+class KotlinHighlightExitPointsHandlerFactory : HighlightUsagesHandlerFactoryBase() {
     companion object {
         private val RETURN_AND_THROW = TokenSet.create(KtTokens.RETURN_KEYWORD, KtTokens.THROW_KEYWORD)
     }
@@ -61,14 +58,14 @@ class KotlinHighlightExitPointsHandlerFactory: HighlightUsagesHandlerFactoryBase
         }
 
         override fun computeUsages(targets: MutableList<PsiElement>?) {
-            val relevantFunction = target.getRelevantFunction()
+            val relevantFunction = target.getRelevantDeclaration()
             relevantFunction?.accept(object : KtVisitorVoid() {
                 override fun visitKtElement(element: KtElement) {
                     element.acceptChildren(this)
                 }
 
                 private fun visitReturnOrThrow(expression: KtExpression) {
-                    if (expression.getRelevantFunction() == relevantFunction) {
+                    if (expression.getRelevantDeclaration() == relevantFunction) {
                         addOccurrence(expression)
                     }
                 }
@@ -85,14 +82,20 @@ class KotlinHighlightExitPointsHandlerFactory: HighlightUsagesHandlerFactoryBase
     }
 }
 
-private fun KtExpression.getRelevantFunction(): KtFunction? {
+private fun KtExpression.getRelevantDeclaration(): KtDeclarationWithBody? {
     if (this is KtReturnExpression) {
         (this.getTargetLabel()?.mainReference?.resolve() as? KtFunction)?.let { return it }
     }
+
     for (parent in parents) {
-        if (InlineUtil.canBeInlineArgument(parent) && !InlineUtil.isInlinedArgument(parent as KtFunction, parent.analyze(), false)) {
-            return parent
+        if (parent is KtDeclarationWithBody) {
+            when {
+                parent is KtPropertyAccessor -> return parent
+                InlineUtil.canBeInlineArgument(parent) && !InlineUtil.isInlinedArgument(parent as KtFunction, parent.analyze(), false) ->
+                    return parent
+            }
         }
     }
+
     return null
 }

idea/testData/exitPoints/getter.kt

@@ -0,0 +1,12 @@
+val Any?.foo: Int
+    get() {
+        this?.let {
+            <caret>return 1
+        }
+        return 2
+    }
+
+public inline fun <T> T.let(block: (T) -> Unit) {}
+
+//HIGHLIGHTED: return 1
+//HIGHLIGHTED: return 2

idea/testData/exitPoints/inline3.kt

@@ -0,0 +1,11 @@
+fun Any?.foo(): Int {
+    this?.let {
+        <caret>return 1
+    }
+    return 2
+}
+
+public inline fun <T> T.let(block: (T) -> Unit) {}
+
+//HIGHLIGHTED: return 1
+//HIGHLIGHTED: return 2

idea/tests/org/jetbrains/kotlin/idea/highlighter/HighlightExitPointsTestGenerated.java

@@ -36,6 +36,12 @@ public class HighlightExitPointsTestGenerated extends AbstractHighlightExitPoint
         KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/exitPoints"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.ANY, true);
     }
 
+    @TestMetadata("getter.kt")
+    public void testGetter() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/exitPoints/getter.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("inline1.kt")
     public void testInline1() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/exitPoints/inline1.kt");
@@ -48,6 +54,12 @@ public class HighlightExitPointsTestGenerated extends AbstractHighlightExitPoint
         doTest(fileName);
     }
 
+    @TestMetadata("inline3.kt")
+    public void testInline3() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/exitPoints/inline3.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("inlineLocalReturn1.kt")
     public void testInlineLocalReturn1() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/exitPoints/inlineLocalReturn1.kt");