From 4c6edd442ee1566bc684d11385f3fcbbee7c5c3b Mon Sep 17 00:00:00 2001
From: Nikita Katkov <nikita.katkov@jetbrains.com>
Date: Thu, 25 Sep 2025 15:17:22 +0200
Subject: [PATCH] [recent files] IJPL-206722 Introduce a registry key that
 controls debounce timeout for typing processing in the recent files frontend
 model

(cherry picked from commit 6c7b7823574c3babf1e98f6932f6c209f24b67b2)

Review: IJ-CR-176981

GitOrigin-RevId: 217fbc54b795d2378aafebf9e3c41c9b534ce5b8
---
 .../resources/intellij.platform.recentFiles.frontend.xml    | 3 +++
 .../recentFiles/frontend/RecentFilesEditorTypingListener.kt | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/platform/recentFiles/frontend/resources/intellij.platform.recentFiles.frontend.xml b/platform/recentFiles/frontend/resources/intellij.platform.recentFiles.frontend.xml
index ba68ac4072b6..58606e671908 100644
--- a/platform/recentFiles/frontend/resources/intellij.platform.recentFiles.frontend.xml
+++ b/platform/recentFiles/frontend/resources/intellij.platform.recentFiles.frontend.xml
@@ -15,6 +15,9 @@
   <extensions defaultExtensionNs="com.intellij">
     <registryKey key="switcher.use.fallback.in.monolith" defaultValue="false"
                  description="Use old Switcher/Recent Files implementation in the monolith mode that is not remove dev-native"/>
+    <registryKey key="switcher.typing.debounce.interval.ms" defaultValue="3000"
+                 description="A time period to skip typing events before requesting a switcher/recent files model update, measured in millis"/>
+
     <postStartupActivity implementation="com.intellij.platform.recentFiles.frontend.model.RecentFileModelSynchronizer"/>
   </extensions>
   <actions>
diff --git a/platform/recentFiles/frontend/src/com/intellij/platform/recentFiles/frontend/RecentFilesEditorTypingListener.kt b/platform/recentFiles/frontend/src/com/intellij/platform/recentFiles/frontend/RecentFilesEditorTypingListener.kt
index 44fb864f77f0..66d5d9326b30 100644
--- a/platform/recentFiles/frontend/src/com/intellij/platform/recentFiles/frontend/RecentFilesEditorTypingListener.kt
+++ b/platform/recentFiles/frontend/src/com/intellij/platform/recentFiles/frontend/RecentFilesEditorTypingListener.kt
@@ -6,6 +6,7 @@ import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.actionSystem.ex.AnActionListener
 import com.intellij.openapi.diagnostic.thisLogger
 import com.intellij.openapi.project.Project
+import com.intellij.openapi.util.registry.Registry
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.openapi.vfs.isFile
 import com.intellij.platform.recentFiles.frontend.model.FrontendRecentFilesModel
@@ -17,6 +18,7 @@ import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.debounce
 import kotlinx.coroutines.launch
+import kotlin.time.Duration.Companion.milliseconds
 import kotlin.time.Duration.Companion.seconds
 
 @OptIn(FlowPreview::class)
@@ -26,7 +28,9 @@ private class RecentFilesEditorTypingListener : AnActionListener {
 
   init {
     RecentFilesApplicationCoroutineScopeProvider.getInstance().coroutineScope.launch {
-      recentlyChangedFiles.debounce(1.seconds)
+      val debounceInterval = Registry.intValue("switcher.typing.debounce.interval.ms", 3000)
+      LOG.debug("RecentFilesEditorTypingListener: debounceInterval=$debounceInterval")
+      recentlyChangedFiles.debounce(debounceInterval.milliseconds)
         .collect { (file, project) ->
           LOG.debug("Adding file to the frontend recent files model after typing: ${file.name}")
           FrontendRecentFilesModel.getInstanceAsync(project).applyFrontendChanges(RecentFileKind.RECENTLY_EDITED, listOf(file), FileChangeKind.ADDED)