revert: remove protected mode

protected mode is designed for borderless and transparent window.
it is not suit for the goal of this fork.

app/actionmanager.cpp

@@ -62,7 +62,6 @@ void ActionManager::setupAction(MainWindow *mainWindow)
     CREATE_NEW_ACTION(mainWindow, actionCopyFilePath);
     CREATE_NEW_THEMEICON_ACTION(mainWindow, actionPaste, edit-paste);
     CREATE_NEW_THEMEICON_ACTION(mainWindow, actionTrash, edit-delete);
-    CREATE_NEW_ACTION(mainWindow, actionToggleProtectMode);
     CREATE_NEW_ACTION(mainWindow, actionToggleAvoidResetTransform);
     CREATE_NEW_ACTION(mainWindow, actionSettings);
     CREATE_NEW_THEMEICON_ACTION(mainWindow, actionHelp, system-help);
@@ -104,7 +103,6 @@ void ActionManager::retranslateUi(MainWindow *mainWindow)
     actionCopyFilePath->setText(QCoreApplication::translate("MainWindow", "Copy &File Path", nullptr));
     actionPaste->setText(QCoreApplication::translate("MainWindow", "&Paste", nullptr));
     actionTrash->setText(QCoreApplication::translate("MainWindow", "Move to Trash", nullptr));
-    actionToggleProtectMode->setText(QCoreApplication::translate("MainWindow", "Protected mode", nullptr));
     actionToggleAvoidResetTransform->setText(QCoreApplication::translate("MainWindow", "Keep transformation", "The 'transformation' means the flip/rotation status that currently applied to the image view"));
     actionSettings->setText(QCoreApplication::translate("MainWindow", "Configure...", nullptr));
     actionHelp->setText(QCoreApplication::translate("MainWindow", "Help", nullptr));

app/actionmanager.h

@@ -45,7 +45,6 @@ public:
     QAction *actionCopyFilePath;
     QAction *actionPaste;
     QAction *actionTrash;
-    QAction *actionToggleProtectMode;
     QAction *actionToggleAvoidResetTransform;
     QAction *actionSettings;
     QAction *actionHelp;

app/mainwindow.cpp

@@ -441,10 +441,6 @@ void MainWindow::contextMenuEvent(QContextMenuEvent *event)
 
     QAction * trash = m_am->actionTrash;
 
-    QAction * protectedMode = m_am->actionToggleProtectMode;
-    protectedMode->setCheckable(true);
-    protectedMode->setChecked(m_protectedMode);
-
     QAction * avoidResetTransform = m_am->actionToggleAvoidResetTransform;
     avoidResetTransform->setCheckable(true);
     avoidResetTransform->setChecked(m_graphicsView->avoidResetTransform());
@@ -475,7 +471,6 @@ void MainWindow::contextMenuEvent(QContextMenuEvent *event)
     menu->addAction(m_am->actionFitByWidth);
 #endif // 0
     menu->addSeparator();
-    menu->addAction(protectedMode);
     menu->addAction(avoidResetTransform);
     menu->addSeparator();
     menu->addAction(toggleSettings);
@@ -565,12 +560,6 @@ void MainWindow::updateWidgetsPosition()
     m_gv->move(width() - m_gv->width(), height() - m_gv->height());
 }
 
-void MainWindow::toggleProtectedMode()
-{
-    m_protectedMode = !m_protectedMode;
-    updateGalleryButtonsVisibility();
-}
-
 void MainWindow::toggleAvoidResetTransform()
 {
     m_graphicsView->setAvoidResetTransform(!m_graphicsView->avoidResetTransform());
@@ -596,9 +585,7 @@ bool MainWindow::canPaste() const
 
 void MainWindow::quitAppAction(bool force)
 {
-    if (!m_protectedMode || force) {
     closeWindow();
-    }
 }
 
 void MainWindow::toggleFullscreen()
@@ -780,11 +767,6 @@ void MainWindow::on_actionAnimationNextFrame_triggered()
     m_graphicsView->scene()->skipAnimationFrame(1);
 }
 
-void MainWindow::on_actionToggleProtectMode_triggered()
-{
-    toggleProtectedMode();
-}
-
 void MainWindow::on_actionToggleAvoidResetTransform_triggered()
 {
     toggleAvoidResetTransform();
@@ -869,8 +851,8 @@ void MainWindow::updateGalleryButtonsVisibility()
 {
     const int galleryFileCount = m_pm->totalCount();
     const bool loopGallery = Settings::instance()->loopGallery();
-    m_prevButton->setVisible(!m_protectedMode && galleryFileCount > 1);
-    m_nextButton->setVisible(!m_protectedMode && galleryFileCount > 1);
+    m_prevButton->setVisible(galleryFileCount > 1);
+    m_nextButton->setVisible(galleryFileCount > 1);
     m_prevButton->setEnabled(loopGallery || !m_pm->isFirstIndex());
     m_nextButton->setEnabled(loopGallery || !m_pm->isLastIndex());
 }

app/mainwindow.h

@@ -61,7 +61,6 @@ protected slots:
     void centerWindow();
     void closeWindow();
     void updateWidgetsPosition();
-    void toggleProtectedMode();
     void toggleAvoidResetTransform();
     bool canPaste() const;
     void quitAppAction(bool force = false);
@@ -95,7 +94,6 @@ private slots:
     void on_actionCopyFilePath_triggered();
     void on_actionPaste_triggered();
     void on_actionTrash_triggered();
-    void on_actionToggleProtectMode_triggered();
     void on_actionToggleAvoidResetTransform_triggered();
     void on_actionSettings_triggered();
     void on_actionHelp_triggered();
@@ -118,7 +116,6 @@ private:
     GraphicsView *m_graphicsView;
     NavigatorView *m_gv;
     BottomButtonGroup *m_bottomButtonGroup;
-    bool m_protectedMode = false;
     bool m_clickedOnWindow = false;
 };