Add ExpandCollapseToggleAction to IdeActions so it can be used by plugins like IdeaVim to support 'za' vim motion

closes https://github.com/JetBrains/intellij-community/pull/2825

GitOrigin-RevId: 27026dda3b9355a652c8ad5d6cb58efdac27ced6

java/java-tests/testSrc/com/intellij/openapi/editor/impl/JavaFoldingTest.java

@@ -1,3 +1,4 @@
+// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.openapi.editor.impl;
 
 import com.intellij.codeInsight.CodeInsightSettings;
@@ -95,6 +96,26 @@ public class JavaFoldingTest extends JavaFoldingTestCase {
     assertEquals(text.indexOf("}", text.indexOf("i++")), myFixture.getEditor().getCaretModel().getOffset());
   }
 
+  public void testExpandCollapseRegionTogglesFold() {
+    String text = """
+      class Test {
+          void test(int i) {
+              if (i > 1) {
+                  <caret>i++;
+              }
+          }
+      }
+      """;
+    configure(text);
+    assertEquals(2, getExpandedFoldRegionsCount());
+
+    myFixture.performEditorAction(IdeActions.ACTION_EXPAND_COLLAPSE_TOGGLE_REGION);
+    assertEquals(1, getExpandedFoldRegionsCount());
+
+    myFixture.performEditorAction(IdeActions.ACTION_EXPAND_COLLAPSE_TOGGLE_REGION);
+    assertEquals(2, getExpandedFoldRegionsCount());
+  }
+
   public void testFoldGroup() {
     // Implied by IDEA-79420
     myFoldingSettings.setCollapseLambdas(true);

platform/ide-core/api-dump-unreviewed.txt

@@ -1204,6 +1204,7 @@ com.intellij.openapi.actionSystem.IdeActions
 - sf:ACTION_EXPAND_ALL:java.lang.String
 - sf:ACTION_EXPAND_ALL_REGIONS:java.lang.String
 - sf:ACTION_EXPAND_ALL_TO_LEVEL_1:java.lang.String
+- sf:ACTION_EXPAND_COLLAPSE_TOGGLE_REGION:java.lang.String
 - sf:ACTION_EXPAND_LIVE_TEMPLATE_BY_TAB:java.lang.String
 - sf:ACTION_EXPAND_LIVE_TEMPLATE_CUSTOM:java.lang.String
 - sf:ACTION_EXPAND_REGION:java.lang.String

platform/ide-core/src/com/intellij/openapi/actionSystem/IdeActions.java

@@ -205,6 +205,7 @@ public interface IdeActions {
   String ACTION_COLLAPSE_REGION_RECURSIVELY = "CollapseRegionRecursively";
   String ACTION_EXPAND_TO_LEVEL_1 = "ExpandToLevel1";
   String ACTION_EXPAND_ALL_TO_LEVEL_1 = "ExpandAllToLevel1";
+  String ACTION_EXPAND_COLLAPSE_TOGGLE_REGION = "ExpandCollapseToggleAction";
 
   String ACTION_NEW_HORIZONTAL_TAB_GROUP = "NewHorizontalTabGroup";
   String ACTION_NEW_VERTICAL_TAB_GROUP = "NewVerticalTabGroup";