[next edit] LLM-19305 Do not suggest rename action for symbols without usages

(cherry picked from commit d4fbc50b1225310c5be57777cc20868ed0af783c)

IJ-CR-183880

GitOrigin-RevId: 674e1ddc0bd215702a6272a570ec92faa34906e5

platform/lang-impl/src/com/intellij/refactoring/suggested/SuggestedRefactoringAvailabilityIndicator.kt

@@ -31,7 +31,10 @@ import org.jetbrains.annotations.Nls
 import org.jetbrains.annotations.TestOnly
 import javax.swing.Icon
 
-class SuggestedRefactoringAvailabilityIndicator(private val project: Project) {
+class SuggestedRefactoringAvailabilityIndicator(
+  @get:ApiStatus.Internal
+  val project: Project
+) {
   private class Data(
     val document: Document,
     val highlighterRangeMarker: RangeMarker,

platform/lang-impl/src/com/intellij/refactoring/suggested/SuggestedRefactoringAvailabilityListener.kt

@@ -0,0 +1,19 @@
+// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package com.intellij.refactoring.suggested
+
+import com.intellij.util.messages.Topic
+import org.jetbrains.annotations.ApiStatus
+
+@ApiStatus.Internal
+interface SuggestedRefactoringAvailabilityListener {
+  fun cleared() {}
+  fun disabled() {}
+  fun updated(state: SuggestedRefactoringState) {}
+  fun reset() {}
+
+  companion object {
+    @Topic.ProjectLevel
+    val TOPIC: Topic<SuggestedRefactoringAvailabilityListener> =
+      Topic(SuggestedRefactoringAvailabilityListener::class.java, Topic.BroadcastDirection.NONE)
+  }
+}

platform/lang-impl/src/com/intellij/refactoring/suggested/SuggestedRefactoringChangeCollector.kt

@@ -100,14 +100,17 @@ class SuggestedRefactoringChangeCollector(
 
   private fun updateAvailabilityIndicator() {
     val state = this.state
+    val publisher = availabilityIndicator.project.messageBus.syncPublisher(SuggestedRefactoringAvailabilityListener.TOPIC)
     if (state == null || state.oldSignature == state.newSignature && state.errorLevel == ErrorLevel.NO_ERRORS) {
       availabilityIndicator.clear()
+      publisher.cleared()
       return
     }
 
     val refactoringSupport = state.refactoringSupport
     if (!state.anchor.isValid || refactoringSupport.nameRange(state.anchor) == null) {
       availabilityIndicator.disable()
+      publisher.disabled()
       return
     }
 
@@ -116,6 +119,7 @@ class SuggestedRefactoringChangeCollector(
     else
       null
     availabilityIndicator.update(state.anchor, refactoringData, refactoringSupport)
+    publisher.updated(state)
   }
 
   @set:TestOnly

platform/lang-impl/src/com/intellij/refactoring/suggested/SuggestedRefactoringChangeListener.kt

@@ -47,6 +47,7 @@ class SuggestedRefactoringChangeListener(
   }
 
   fun reset(withNewIdentifiers: Boolean = false) {
+    project.messageBus.syncPublisher(SuggestedRefactoringAvailabilityListener.TOPIC).reset()
     if (editingState != null) {
       editingState!!.signatureRangeMarker.dispose()
       editingState!!.importRangeMarker?.dispose()