Add undo/redo action for dialogEdit

mainwindow.cpp

@@ -65,6 +65,16 @@ MainWindow::MainWindow(QWidget *parent)
         }
     });
 
+    connect(ui->dialogEdit, &QPlainTextEdit::textChanged, this, [this]() {
+        static QString previousText = ui->dialogEdit->toPlainText();
+        if (m_handlingUndoRedo) return;
+        QString currentText = ui->dialogEdit->toPlainText();
+        if (currentText != previousText) {
+            undoStack->push(new PlainTextEditCommand(ui->dialogEdit, previousText, currentText, this));
+            previousText = currentText;
+        }
+    });
+
     connect(ui->actionEditUndo, &QAction::triggered, undoStack, &QUndoStack::undo);
     connect(ui->actionEditRedo, &QAction::triggered, undoStack, &QUndoStack::redo);
     currentPath->getStep().append(Step());
@@ -997,4 +1007,4 @@ void MainWindow::on_actionFont_color_triggered()
 void MainWindow::on_addStep_clicked()
 {
     this->addNewStep();
-}
+}