[VIM-696] Restore visual mode after undo/redo, and disable incompatible actions

src/main/java/com/maddyhome/idea/vim/group/IjOptions.kt

@@ -83,11 +83,11 @@ public object IjOptions {
   public val trackactionids: ToggleOption = addOption(ToggleOption("trackactionids", GLOBAL, "tai", false))
   public val unifyjumps: ToggleOption = addOption(ToggleOption("unifyjumps", GLOBAL, "unifyjumps", true))
   public val visualdelay: UnsignedNumberOption = addOption(UnsignedNumberOption("visualdelay", GLOBAL, "visualdelay", 100))
-  public val oldundo: ToggleOption = addOption(ToggleOption("oldundo", GLOBAL, "oldundo", false, isTemporary = true))
+  public val oldundo: ToggleOption = addOption(ToggleOption("oldundo", GLOBAL, "oldundo", true, isTemporary = true))
   public val vimscriptFunctionAnnotation: ToggleOption = addOption(ToggleOption("vimscriptfunctionannotation", GLOBAL, "vimscriptfunctionannotation", true, isTemporary = true))
   public val commandOrMotionAnnotation: ToggleOption = addOption(ToggleOption("commandormotionannotation", GLOBAL, "commandormotionannotation", true, isTemporary = true))
 
   // This needs to be Option<out VimDataType> so that it can work with derived option types, such as NumberOption, which
   // derives from Option<VimInt>
   private fun <T : Option<out VimDataType>> addOption(option: T) = option.also { Options.addOption(option) }
-}
+}

src/main/java/com/maddyhome/idea/vim/helper/UndoRedoHelper.kt

@@ -14,6 +14,7 @@ import com.intellij.openapi.command.CommandProcessor
 import com.intellij.openapi.command.undo.UndoManager
 import com.intellij.openapi.components.Service
 import com.intellij.openapi.fileEditor.impl.text.TextEditorProvider
+import com.maddyhome.idea.vim.VimPlugin
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.injector
@@ -21,6 +22,8 @@ import com.maddyhome.idea.vim.common.ChangesListener
 import com.maddyhome.idea.vim.listener.SelectionVimListenerSuppressor
 import com.maddyhome.idea.vim.newapi.globalIjOptions
 import com.maddyhome.idea.vim.newapi.ij
+import com.maddyhome.idea.vim.state.mode.SelectionType
+import com.maddyhome.idea.vim.state.mode.inVisualMode
 import com.maddyhome.idea.vim.undo.UndoRedoBase
 
 /**
@@ -39,6 +42,7 @@ internal class UndoRedoHelper : UndoRedoBase() {
 
       if (injector.globalIjOptions().oldundo) {
         SelectionVimListenerSuppressor.lock().use { undoManager.undo(fileEditor) }
+        restoreVisualMode(editor)
       } else {
         // TODO refactor me after VIM-308 when restoring selection and caret movement will be ignored by undo
         editor.runWithChangeTracking {
@@ -74,6 +78,7 @@ internal class UndoRedoHelper : UndoRedoBase() {
     if (undoManager.isRedoAvailable(fileEditor)) {
       if (injector.globalIjOptions().oldundo) {
         SelectionVimListenerSuppressor.lock().use { undoManager.redo(fileEditor) }
+        restoreVisualMode(editor)
       } else {
         undoManager.redo(fileEditor)
         CommandProcessor.getInstance().runUndoTransparentAction {
@@ -131,4 +136,21 @@ internal class UndoRedoHelper : UndoRedoBase() {
     val hasChanges: Boolean
       get() = changeListener.hasChanged || initialPath != editor.getPath()
   }
+
+  private fun restoreVisualMode(editor: VimEditor) {
+    if (!editor.inVisualMode && editor.getSelectionModel().hasSelection()) {
+      val detectedMode = VimPlugin.getVisualMotion().autodetectVisualSubmode(editor)
+      
+      // Visual block selection is restored into multiple carets, so multi-carets that form a block are always
+      // identified as visual block mode, leading to false positives.
+      // Since I use visual block mode much less often than multi-carets, this is a judgment call to never restore
+      // visual block mode.
+      val wantedMode = if (detectedMode == SelectionType.BLOCK_WISE)
+        SelectionType.CHARACTER_WISE
+      else
+        detectedMode
+      
+      VimPlugin.getVisualMotion().enterVisualMode(editor, wantedMode)
+    }
+  }
 }

src/main/resources/META-INF/includes/VimActions.xml

@@ -226,12 +226,12 @@
 
     <!-- Change -->
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseLowerMotionAction" mappingModes="N" keys="gu"/>
-    <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseLowerVisualAction" mappingModes="X" keys="u"/>
+<!--    <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseLowerVisualAction" mappingModes="X" keys="u"/>-->
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseToggleCharacterAction" mappingModes="N" keys="~"/>
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseToggleMotionAction" mappingModes="N" keys="g~"/>
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseToggleVisualAction" mappingModes="X" keys="~"/>
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseUpperMotionAction" mappingModes="N" keys="gU"/>
-    <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseUpperVisualAction" mappingModes="X" keys="U"/>
+<!--    <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCaseUpperVisualAction" mappingModes="X" keys="U"/>-->
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCharacterAction" mappingModes="N" keys="r"/>
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeCharactersAction" mappingModes="N" keys="s"/>
     <vimAction implementation="com.maddyhome.idea.vim.action.change.change.ChangeEndOfLineAction" mappingModes="N" keys="C"/>
@@ -329,8 +329,8 @@
     <vimAction implementation="com.maddyhome.idea.vim.action.change.RepeatChangeAction" mappingModes="N" keys="."/>
     <vimAction implementation="com.maddyhome.idea.vim.action.ExEntryAction" mappingModes="NXO" keys=":"/>
     <vimAction implementation="com.maddyhome.idea.vim.action.ResetModeAction" mappingModes="ALL" keys="«C-\»«C-N»"/>
-    <vimAction implementation="com.maddyhome.idea.vim.action.change.RedoAction" mappingModes="N" keys="«C-R»"/>
-    <vimAction implementation="com.maddyhome.idea.vim.action.change.UndoAction" mappingModes="N"/>
+    <vimAction implementation="com.maddyhome.idea.vim.action.change.RedoAction" mappingModes="NX" keys="U,«C-R»"/>
+    <vimAction implementation="com.maddyhome.idea.vim.action.change.UndoAction" mappingModes="NX"/>
 
     <!-- Keys -->
     <vimAction implementation="com.maddyhome.idea.vim.action.change.OperatorAction" mappingModes="N" keys="g@"/>

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/RedoAction.kt

@@ -16,7 +16,7 @@ import com.maddyhome.idea.vim.command.Command
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.handler.VimActionHandler
 
-@CommandOrMotion(keys = ["<C-R>"], modes = [Mode.NORMAL])
+@CommandOrMotion(keys = ["U", "<C-R>"], modes = [Mode.NORMAL, Mode.VISUAL])
 public class RedoAction : VimActionHandler.SingleExecution() {
   override val type: Command.Type = Command.Type.OTHER_SELF_SYNCHRONIZED
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/UndoAction.kt

@@ -19,7 +19,7 @@ import com.maddyhome.idea.vim.handler.VimActionHandler
 import java.awt.event.KeyEvent
 import javax.swing.KeyStroke
 
-@CommandOrMotion(keys = ["u", "<Undo>"], modes = [Mode.NORMAL])
+@CommandOrMotion(keys = ["u", "<Undo>"], modes = [Mode.NORMAL, Mode.VISUAL])
 public class UndoAction : VimActionHandler.SingleExecution(), ComplicatedKeysAction {
   override val keyStrokesSet: Set<List<KeyStroke>> = setOf(
     injector.parser.parseKeys("u"),

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeCaseLowerVisualAction.kt

@@ -8,7 +8,6 @@
 package com.maddyhome.idea.vim.action.change.change
 
 import com.intellij.vim.annotations.CommandOrMotion
-import com.intellij.vim.annotations.Mode
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.VimCaret
 import com.maddyhome.idea.vim.api.VimEditor
@@ -25,7 +24,7 @@ import java.util.*
 /**
  * @author vlan
  */
-@CommandOrMotion(keys = ["u"], modes = [Mode.VISUAL])
+@CommandOrMotion(keys = [], modes = [])
 public class ChangeCaseLowerVisualAction : VisualOperatorActionHandler.ForEachCaret() {
   override val type: Command.Type = Command.Type.CHANGE
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeCaseUpperVisualAction.kt

@@ -8,7 +8,6 @@
 package com.maddyhome.idea.vim.action.change.change
 
 import com.intellij.vim.annotations.CommandOrMotion
-import com.intellij.vim.annotations.Mode
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.VimCaret
 import com.maddyhome.idea.vim.api.VimEditor
@@ -25,7 +24,7 @@ import java.util.*
 /**
  * @author vlan
  */
-@CommandOrMotion(keys = ["U"], modes = [Mode.VISUAL])
+@CommandOrMotion(keys = [], modes = [])
 public class ChangeCaseUpperVisualAction : VisualOperatorActionHandler.ForEachCaret() {
   override val type: Command.Type = Command.Type.CHANGE