Add support for Redo operations

This MR updates Dolphin to support redo functionality added in KIO's FileUndoManager. It enables triggering redo operations from the user interface and ensures appropriate integration with the undo/redo command flow.

Require: [!1941](https://invent.kde.org/frameworks/kio/-/merge_requests/1941)

BUG: 451746

4 files changed, 63 insertions, 6 deletions

diff --git a/src/dolphinmainwindow.cpp b/src/dolphinmainwindow.cpp
index 917aa42ce..f7ca69553 100644
--- a/src/dolphinmainwindow.cpp
+++ b/src/dolphinmainwindow.cpp
@@ -156,6 +156,10 @@ DolphinMainWindow::DolphinMainWindow()
 
     connect(undoManager, &KIO::FileUndoManager::undoAvailable, this, &DolphinMainWindow::slotUndoAvailable);
     connect(undoManager, &KIO::FileUndoManager::undoTextChanged, this, &DolphinMainWindow::slotUndoTextChanged);
+#if KIO_VERSION >= QT_VERSION_CHECK(6, 17, 0)
+    connect(undoManager, &KIO::FileUndoManager::redoAvailable, this, &DolphinMainWindow::slotRedoAvailable);
+    connect(undoManager, &KIO::FileUndoManager::redoTextChanged, this, &DolphinMainWindow::slotRedoTextChanged);
+#endif
     connect(undoManager, &KIO::FileUndoManager::jobRecordingStarted, this, &DolphinMainWindow::clearStatusBar);
     connect(undoManager, &KIO::FileUndoManager::jobRecordingFinished, this, &DolphinMainWindow::showCommand);
 
@@ -891,6 +895,31 @@ void DolphinMainWindow::undo()
     KIO::FileUndoManager::self()->undo();
 }
 
+#if KIO_VERSION >= QT_VERSION_CHECK(6, 17, 0)
+void DolphinMainWindow::slotRedoAvailable(bool available)
+{
+    QAction *redoAction = actionCollection()->action(KStandardAction::name(KStandardAction::Redo));
+    if (redoAction) {
+        redoAction->setEnabled(available);
+    }
+}
+
+void DolphinMainWindow::slotRedoTextChanged(const QString &text)
+{
+    QAction *redoAction = actionCollection()->action(KStandardAction::name(KStandardAction::Redo));
+    if (redoAction) {
+        redoAction->setText(text);
+    }
+}
+
+void DolphinMainWindow::redo()
+{
+    clearStatusBar();
+    KIO::FileUndoManager::self()->uiInterface()->setParentWidget(this);
+    KIO::FileUndoManager::self()->redo();
+}
+#endif
+
 void DolphinMainWindow::cut()
 {
     if (m_activeViewContainer->view()->selectedItems().isEmpty()) {
@@ -1554,6 +1583,9 @@ void DolphinMainWindow::updateHamburgerMenu()
     }
     menu->addAction(ac->action(QStringLiteral("basic_actions")));
     menu->addAction(ac->action(KStandardAction::name(KStandardAction::Undo)));
+#if KIO_VERSION >= QT_VERSION_CHECK(6, 17, 0)
+    menu->addAction(ac->action(KStandardAction::name(KStandardAction::Redo)));
+#endif
     if (!toolBar()->isVisible()
         || (!toolbarActions.contains(ac->action(QStringLiteral("toggle_search")))
             && !toolbarActions.contains(ac->action(QStringLiteral("open_preferred_search_tool"))))) {
@@ -1813,6 +1845,9 @@ void DolphinMainWindow::setupActions()
 
     // setup 'Edit' menu
     KStandardAction::undo(this, &DolphinMainWindow::undo, actionCollection());
+#if KIO_VERSION >= QT_VERSION_CHECK(6, 17, 0)
+    KStandardAction::redo(this, &DolphinMainWindow::redo, actionCollection());
+#endif
 
     // i18n: This will be the last paragraph for the whatsthis for all three:
     // Cut, Copy and Paste
@@ -2094,6 +2129,18 @@ void DolphinMainWindow::setupActions()
                                     "will ask for your confirmation beforehand."));
     undoAction->setEnabled(false); // undo should be disabled by default
 
+#if KIO_VERSION >= QT_VERSION_CHECK(6, 17, 0)
+    auto redoAction = actionCollection()->action(KStandardAction::name(KStandardAction::Redo));
+    redoAction->setWhatsThis(xi18nc("@info:whatsthis",
+                                    "This redoes "
+                                    "the last change you undid.<nl/>"
+                                    "Such changes include <interface>creating</interface>, <interface>renaming</interface> "
+                                    "and <interface>moving</interface> files or folders to a different location "
+                                    "or to the <filename>Trash</filename>.<nl/>Any changes that cannot be undone "
+                                    "will ask for your confirmation beforehand."));
+    redoAction->setEnabled(false); // redo should be disabled by default
+#endif
+
     {
         QScopedPointer<QAction> forwardAction(KStandardAction::forward(nullptr, nullptr, nullptr));
         m_forwardAction = new KToolBarPopupAction(forwardAction->icon(), forwardAction->text(), actionCollection());
diff --git a/src/dolphinmainwindow.h b/src/dolphinmainwindow.h
index 4952085f0..2c8d444ad 100644
--- a/src/dolphinmainwindow.h
+++ b/src/dolphinmainwindow.h
@@ -314,6 +314,20 @@ private Q_SLOTS:
     /** Performs the current undo operation. */
     void undo();
 
+#if KIO_VERSION >= QT_VERSION_CHECK(6, 17, 0)
+    /**
+     * Updates the state of the 'Redo' menu action dependent
+     * on the parameter \a available.
+     */
+    void slotRedoAvailable(bool available);
+
+    /** Sets the text of the 'Redo' menu action to \a text. */
+    void slotRedoTextChanged(const QString &text);
+
+    /** Performs the current redo operation. */
+    void redo();
+#endif
+
     /**
      * Copies all selected items to the clipboard and marks
      * the items as cut.
diff --git a/src/dolphinui.rc b/src/dolphinui.rc
index 6bac6a193..93666b6bb 100644
--- a/src/dolphinui.rc
+++ b/src/dolphinui.rc
@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <!DOCTYPE gui SYSTEM "kpartgui.dtd">
-<gui name="dolphin" version="47">
+<gui name="dolphin" version="48">
     <MenuBar>
         <Menu name="file">
             <Action name="new_menu" />
@@ -21,8 +21,6 @@
             <Action name="properties" />
         </Menu>
         <Menu name="edit">
-            <Action name="edit_undo" />
-            <Separator />
             <Action name="edit_cut" />
             <Action name="edit_copy" />
             <Action name="copy_location" />
diff --git a/src/dolphinuiforphones.rc b/src/dolphinuiforphones.rc
index 7e9d72c8e..b2a9fc6fe 100644
--- a/src/dolphinuiforphones.rc
+++ b/src/dolphinuiforphones.rc
@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <!DOCTYPE gui SYSTEM "kpartgui.dtd">
-<gui name="dolphin" version="4">
+<gui name="dolphin" version="5">
     <MenuBar>
         <Menu name="file">
             <Action name="new_menu" />
@@ -21,8 +21,6 @@
             <Action name="properties" />
         </Menu>
         <Menu name="edit">
-            <Action name="edit_undo" />
-            <Separator />
             <Action name="edit_cut" />
             <Action name="edit_copy" />
             <Action name="copy_location" />