Convert function to property: suggest on fun keyword

#KT-34450 Fixed

idea/src/org/jetbrains/kotlin/idea/intentions/ConvertFunctionToPropertyIntention.kt

@@ -20,6 +20,7 @@ import com.intellij.codeInsight.intention.LowPriorityAction
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.Key
+import com.intellij.openapi.util.TextRange
 import com.intellij.openapi.util.text.StringUtil
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiMethod
@@ -45,10 +46,7 @@ import org.jetbrains.kotlin.load.java.JvmAbi
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.KtPsiFactory.CallableBuilder.Target.READ_ONLY_PROPERTY
-import org.jetbrains.kotlin.psi.psiUtil.endOffset
-import org.jetbrains.kotlin.psi.psiUtil.getParentOfTypeAndBranch
-import org.jetbrains.kotlin.psi.psiUtil.getStartOffsetIn
-import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
+import org.jetbrains.kotlin.psi.psiUtil.*
 import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
 import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
 import org.jetbrains.kotlin.resolve.scopes.utils.findVariable
@@ -198,8 +196,9 @@ class ConvertFunctionToPropertyIntention :
     override fun startInWriteAction(): Boolean = false
 
     override fun isApplicableTo(element: KtNamedFunction, caretOffset: Int): Boolean {
+        val funKeyword = element.funKeyword ?: return false
         val identifier = element.nameIdentifier ?: return false
-        if (!identifier.textRange.containsOffset(caretOffset)) return false
+        if (!TextRange(funKeyword.startOffset, identifier.endOffset).containsOffset(caretOffset)) return false
 
         if (element.valueParameters.isNotEmpty() || element.isLocal) return false
 

idea/testData/intentions/convertFunctionToProperty/onFunKeyword.kt

@@ -0,0 +1 @@
+<caret>fun foo(): Int = 1

idea/testData/intentions/convertFunctionToProperty/onFunKeyword.kt.after

@@ -0,0 +1,2 @@
+val foo: Int
+    get() = 1

idea/tests/org/jetbrains/kotlin/idea/intentions/IntentionTestGenerated.java

@@ -4500,6 +4500,11 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             runTest("idea/testData/intentions/convertFunctionToProperty/nothingFun.kt");
         }
 
+        @TestMetadata("onFunKeyword.kt")
+        public void testOnFunKeyword() throws Exception {
+            runTest("idea/testData/intentions/convertFunctionToProperty/onFunKeyword.kt");
+        }
+
         @TestMetadata("otherRefs.kt")
         public void testOtherRefs() throws Exception {
             runTest("idea/testData/intentions/convertFunctionToProperty/otherRefs.kt");