IDEA-370048 Stream trace debugging does not show the traces for the gatherers and toList method - toList support

GitOrigin-RevId: 8758ddf107d8bd9e028743ba8d9592f239d22bed

plugins/stream-debugger/src/com/intellij/debugger/streams/lib/impl/StandardLibrarySupport.kt

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// 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.debugger.streams.lib.impl
 
 import com.intellij.debugger.streams.core.lib.impl.*
@@ -44,6 +44,7 @@ class StandardLibrarySupport
                                     OptionalResultOperation("findAny"),
                                     OptionalResultOperation("findFirst"),
                                     ToCollectionOperation("toArray"),
+                                    ToCollectionOperation("toList"),
                                     ToCollectionOperation("collect"))
   }
 }

plugins/stream-debugger/test/com/intellij/debugger/streams/exec/SpecialCasesTest.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// 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.debugger.streams.exec;
 
 import com.intellij.debugger.streams.test.TraceExecutionTestCase;
@@ -39,4 +39,8 @@ public class SpecialCasesTest extends TraceExecutionTestCase {
   public void testToCollection() {
     doTest(false);
   }
+
+ public void testToList() {
+    doTest(false);
+  }
 }

plugins/stream-debugger/test/com/intellij/debugger/streams/test/TraceExecutionTestCase.kt

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// 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.debugger.streams.test
 
 import com.intellij.debugger.DebuggerTestCase
@@ -16,6 +16,8 @@ import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.application.PluginPathManager
 import com.intellij.openapi.application.runInEdt
 import com.intellij.openapi.diagnostic.Logger
+import com.intellij.pom.java.LanguageLevel
+import com.intellij.testFramework.IdeaTestUtil
 import com.intellij.testFramework.SkipSlowTestLocally
 import com.intellij.testFramework.runInEdtAndWait
 import com.intellij.util.Producer
@@ -47,6 +49,11 @@ abstract class TraceExecutionTestCase : DebuggerTestCase() {
     }
   }
 
+  override fun setUpModule() {
+    super.setUpModule()
+    IdeaTestUtil.setModuleLanguageLevel(myModule, LanguageLevel.JDK_16)
+  }
+
   protected open fun replaceAdditionalInOutput(str: String): String {
     return str
   }

plugins/stream-debugger/testData/debug/outs/toList.out

@@ -0,0 +1,34 @@
+LineBreakpoint created at ToList.java:6
+!JDK_HOME!\bin\java -agentlib:jdwp=transport=dt_socket,address=!HOST_NAME!:!HOST_PORT!,suspend=y,server=n -Dfile.encoding=!FILE_ENCODING! -classpath !OUTPUT_PATH!;!RT_JAR! ToList
+Connected to the target VM, address: '!HOST_NAME!:PORT_NAME!', transport: 'socket'
+ToList.java:6
+Stream.of(1, 2, 3, 4, 5, 6)
+.filter(x -> x < 3)
+.toList()
+filter
+    before: 1,3,5,6,7,8
+    after: 2,4
+toList
+    before: 2,4
+    after: 9,10
+mappings for filter
+  direct:
+    1 -> 2
+    3 -> 4
+    5 -> nothing
+    6 -> nothing
+    7 -> nothing
+    8 -> nothing
+  reverse:
+    1 <- 2
+    3 <- 4
+mappings for toList
+  direct:
+    2 -> 9
+    4 -> 10
+  reverse:
+    2 <- 9
+    4 <- 10
+Disconnected from the target VM, address: '!HOST_NAME!:PORT_NAME!', transport: 'socket'
+
+Process finished with exit code 0

plugins/stream-debugger/testData/debug/src/ToList.java

@@ -0,0 +1,8 @@
+import java.util.stream.Stream;
+
+public class ToList {
+  public static void main(String[] args) {
+    // Breakpoint!
+    Stream.of(1, 2, 3, 4, 5, 6).filter(x -> x < 3).toList();
+  }
+}