From 00ececf543b9ef6f9f3b02bbcf6a6bef1435f125 Mon Sep 17 00:00:00 2001
From: Max Medvedev <maxim.medvedev@jetbrains.com>
Date: Fri, 14 Nov 2025 12:39:38 +0100
Subject: [PATCH] IJPL-218636 [psi] send children-change events on changing
 content of file without document

GitOrigin-RevId: 25c4213e205307f3d1c921f45a1603c18667ad9e
---
 .../psi/impl/file/impl/PsiVFSListener.kt      |  8 +++--
 .../impl/file/impl/MultiversePsiEventTest.kt  | 35 +++++++++++++++++++
 2 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.kt b/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.kt
index cf520b3e3c5d..954250d963df 100644
--- a/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.kt
+++ b/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.kt
@@ -784,8 +784,8 @@ private class MyFileDocumentManagerListener(private val project: Project) : File
   private val fileManager = PsiManagerEx.getInstanceEx(project).fileManager as FileManagerEx
 
   override fun fileWithNoDocumentChanged(file: VirtualFile) {
-    val viewProvider = fileManager.findCachedViewProvider(file)
-    if (viewProvider == null) {
+    val viewProviders = fileManager.findCachedViewProviders(file)
+    if (viewProviders.isEmpty()) {
       project.service<PsiVFSListener>().handleVfsChangeWithoutPsi(file)
     }
     else {
@@ -794,7 +794,9 @@ private class MyFileDocumentManagerListener(private val project: Project) : File
           fileManager.forceReload(file)
         }
         else {
-          fileManager.reloadPsiAfterTextChange(viewProvider, file)
+          for (viewProvider in viewProviders) {
+            fileManager.reloadPsiAfterTextChange(viewProvider, file)
+          }
         }
       })
     }
diff --git a/platform/lang-impl/testSources/com/intellij/psi/impl/file/impl/MultiversePsiEventTest.kt b/platform/lang-impl/testSources/com/intellij/psi/impl/file/impl/MultiversePsiEventTest.kt
index 92f1b12444f4..2c6d06d84b95 100644
--- a/platform/lang-impl/testSources/com/intellij/psi/impl/file/impl/MultiversePsiEventTest.kt
+++ b/platform/lang-impl/testSources/com/intellij/psi/impl/file/impl/MultiversePsiEventTest.kt
@@ -16,6 +16,7 @@ import com.intellij.psi.PsiTreeChangeAdapter
 import com.intellij.psi.PsiTreeChangeEvent
 import com.intellij.psi.PsiTreeChangeListener
 import com.intellij.psi.impl.PsiManagerEx
+import com.intellij.psi.impl.PsiTreeChangeEventImpl
 import com.intellij.testFramework.IndexingTestUtil
 import com.intellij.testFramework.common.timeoutRunBlocking
 import com.intellij.testFramework.junit5.TestApplication
@@ -231,6 +232,40 @@ internal class MultiversePsiEventTest {
     )
   }
 
+  @Test
+  fun `test we receive 2 before children changed events on updating content of a file with 2 psi files and WITHOT a document `() = doChangeTest(
+    listenerFactory = { counter ->
+      object : PsiTreeChangeAdapter() {
+        override fun beforeChildrenChange(event: PsiTreeChangeEvent) {
+          if (!(event as PsiTreeChangeEventImpl).isGenericChange) {
+            counter.incrementAndGet()
+          }
+        }
+      }
+    },
+    updateBlock = { file ->
+      file.setBinaryContent("class Baz {}".toByteArray())
+    },
+    expectedEventNumber = 2
+  )
+
+  @Test
+  fun `test we receive 2 children changed events on updating content of a file with 2 psi files and WITHOT a document `() = doChangeTest(
+    listenerFactory = { counter ->
+      object : PsiTreeChangeAdapter() {
+        override fun childrenChanged(event: PsiTreeChangeEvent) {
+          if (!(event as PsiTreeChangeEventImpl).isGenericChange) {
+            counter.incrementAndGet()
+          }
+        }
+      }
+    },
+    updateBlock = { file ->
+      file.setBinaryContent("class Baz {}".toByteArray())
+    },
+    expectedEventNumber = 2
+  )
+
   private fun doChangeTest(
     listenerFactory: (AtomicInteger) -> PsiTreeChangeListener,
     updateBlock: (file: VirtualFile) -> Unit,