Fix Del and BS not working in Select mode

Fixes VIM-3618

src/main/java/com/maddyhome/idea/vim/group/KeyGroup.java

@@ -314,7 +314,7 @@ public class KeyGroup extends VimKeyGroupBase implements PersistentStateComponen
       if (c instanceof JComponent) {
         final List<AnAction> actions = ActionUtil.getActions((JComponent)c);
         for (AnAction action : actions) {
-          if (action instanceof VimShortcutKeyAction) {
+          if (action instanceof VimShortcutKeyAction || action == VimShortcutKeyAction.getInstance()) {
             continue;
           }
           final Shortcut[] shortcuts = action.getShortcutSet().getShortcuts();
@@ -334,7 +334,11 @@ public class KeyGroup extends VimKeyGroupBase implements PersistentStateComponen
     final Keymap keymap = KeymapManager.getInstance().getActiveKeymap();
     for (String id : keymap.getActionIds(keyStroke)) {
       final AnAction action = ActionManager.getInstance().getAction(id);
-      if (action != null) {
+
+      // EmptyAction is used to reserve a shortcut, but can't be executed. Code can ask for an action by ID and
+      // use its shortcut(s) to dynamically register a new action on a component in the UI hierarchy. It's not
+      // useful for our needs here - we'll pick up the real action when we get local actions.
+      if (action != null && !(action instanceof EmptyAction)) {
         results.add(action);
       }
     }

src/test/java/org/jetbrains/plugins/ideavim/action/motion/select/SelectDeleteActionTest.kt

@@ -0,0 +1,167 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.action.motion.select
+
+import com.maddyhome.idea.vim.state.mode.Mode
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.Test
+
+class SelectDeleteActionTest : VimTestCase() {
+  @Test
+  fun `test Delete removes text and returns to Normal mode`() {
+    doTest(
+      listOf("ve", "<C-G>", "<Del>"),
+      """
+        |Lorem Ipsum
+        |
+        |I ${c}found it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      """
+        |Lorem Ipsum
+        |
+        |I $c it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      Mode.NORMAL()
+    )
+  }
+
+  @Test
+  fun `test Delete removes text and returns to Insert mode when invoked from Insert Select`() {
+    doTest(
+      listOf("i", "<S-Right>".repeat(5), "<Del>"),
+      """
+        |Lorem Ipsum
+        |
+        |I ${c}found it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      """
+        |Lorem Ipsum
+        |
+        |I $c it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      Mode.INSERT
+    ) {
+      enterCommand("set selectmode=key keymodel=startsel")
+    }
+  }
+
+  @Test
+  fun `test Delete removes text and returns to Replace mode when invoked from Select with pending Replace mode`() {
+    doTest(
+      listOf("R", "<S-Right>".repeat(5), "<Del>"),
+      """
+        |Lorem Ipsum
+        |
+        |I ${c}found it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      """
+        |Lorem Ipsum
+        |
+        |I $c it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      Mode.REPLACE
+    ) {
+      enterCommand("set selectmode=key keymodel=startsel")
+    }
+  }
+
+  @Test
+  fun `test Backspace deletes text and returns to Normal mode`() {
+    doTest(
+      listOf("ve", "<C-G>", "<Del>"),
+      """
+        |Lorem Ipsum
+        |
+        |I ${c}found it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      """
+        |Lorem Ipsum
+        |
+        |I $c it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      Mode.NORMAL()
+    )
+  }
+
+  @Test
+  fun `test Backspace removes text and returns to Insert mode when invoked from Insert Select`() {
+    doTest(
+      listOf("i", "<S-Right>".repeat(5), "<BS>"),
+      """
+        |Lorem Ipsum
+        |
+        |I ${c}found it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      """
+        |Lorem Ipsum
+        |
+        |I $c it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      Mode.INSERT
+    ) {
+      enterCommand("set selectmode=key keymodel=startsel")
+    }
+  }
+
+  @Test
+  fun `test Backspace removes text and returns to Replace mode when invoked from Select with pending Replace mode`() {
+    doTest(
+      listOf("R", "<S-Right>".repeat(5), "<BS>"),
+      """
+        |Lorem Ipsum
+        |
+        |I ${c}found it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      """
+        |Lorem Ipsum
+        |
+        |I $c it in a legendary land
+        |consectetur adipiscing elit
+        |Sed in orci mauris.
+        |Cras id tellus in ex imperdiet egestas.
+      """.trimMargin(),
+      Mode.REPLACE
+    ) {
+      enterCommand("set selectmode=key keymodel=startsel")
+    }
+  }
+}

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/select/SelectDeleteAction.kt

@@ -19,30 +19,45 @@ import com.maddyhome.idea.vim.handler.VimActionHandler
 import java.awt.event.KeyEvent
 import javax.swing.KeyStroke
 
-/**
- * @author Alex Plate
- */
+@CommandOrMotion(keys = ["<DEL>"], modes = [Mode.SELECT])
+class SelectDeleteAction : SelectDeleteBackspaceActionBase() {
+  override val keyStroke: KeyStroke
+    get() = KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0)
+}
 
-@CommandOrMotion(keys = ["<BS>", "<DEL>"], modes = [Mode.SELECT])
-class SelectDeleteAction : VimActionHandler.SingleExecution() {
+@CommandOrMotion(keys = ["<BS>"], modes = [Mode.SELECT])
+class SelectBackspaceAction : SelectDeleteBackspaceActionBase() {
+  override val keyStroke: KeyStroke
+    get() = KeyStroke.getKeyStroke(KeyEvent.VK_BACK_SPACE, 0)
+}
 
+abstract class SelectDeleteBackspaceActionBase : VimActionHandler.SingleExecution() {
   override val type: Command.Type = Command.Type.INSERT
 
+  abstract val keyStroke: KeyStroke
+
   override fun execute(
     editor: VimEditor,
     context: ExecutionContext,
     cmd: Command,
     operatorArguments: OperatorArguments,
   ): Boolean {
-    val enterKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_BACK_SPACE, 0)
-    val actions = injector.keyGroup.getActions(editor, enterKeyStroke)
+    // TODO: It would be nice to know _why_ we use native actions for Delete/Backspace
+    // If there's some kind of additional native editor action bound to Delete or Backspace (e.g. cancelling something,
+    // etc.) then we should of course invoke it, like we do with Escape or Enter. But if we do, we should reconsider
+    // unconditionally exiting Select mode. If the additional native editor action doesn't delete the text, then we're
+    // exiting Select mode incorrectly. If there isn't an additional native editor action, then would it just be simpler
+    // to delete the selected text using editor APIs?
+    val actions = injector.keyGroup.getActions(editor, keyStroke)
     for (action in actions) {
       if (injector.actionExecutor.executeAction(editor, action, context)) {
         break
       }
     }
+
+    // Note that Vim returns to the pending mode. I.e., when starting Select from Normal/Visual, it will return to
+    // Normal. When returning from Insert or Replace pending Select (via shifted keys), it will return to Insert/Replace
     editor.exitSelectModeNative(true)
-    injector.changeGroup.insertBeforeCursor(editor, context)
     return true
   }
 }

vim-engine/src/main/resources/ksp-generated/engine_commands.json

@@ -126,7 +126,7 @@
     },
     {
         "keys": "<BS>",
-        "class": "com.maddyhome.idea.vim.action.motion.select.SelectDeleteAction",
+        "class": "com.maddyhome.idea.vim.action.motion.select.SelectBackspaceAction",
         "modes": "S"
     },
     {