add opening sequence to the import undo command

app/widget/timelinewidget/tool/import.cpp

@@ -37,6 +37,7 @@
 #include "project/item/sequence/sequence.h"
 #include "widget/nodeview/nodeviewundo.h"
 #include "window/mainwindow/mainwindow.h"
+#include "window/mainwindow/mainwindowundo.h"
 
 namespace olive {
 
@@ -472,14 +473,14 @@ void ImportTool::DropGhosts(bool insert)
     }
   }
 
+  if (open_sequence) {
+    command->add_child(new OpenSequenceCommand(open_sequence));
+  }
+
   Core::instance()->undo_stack()->pushIfHasChildren(command);
 
   parent()->ClearGhosts();
   dragged_footage_.clear();
-
-  if (open_sequence) {
-    Core::instance()->main_window()->OpenSequence(open_sequence);
-  }
 }
 
 ImportTool::DraggedFootage ImportTool::FootageToDraggedFootage(Footage *f)

app/window/mainwindow/CMakeLists.txt

@@ -24,5 +24,7 @@ set(OLIVE_SOURCES
   window/mainwindow/mainwindow.cpp
   window/mainwindow/mainwindowlayoutinfo.h
   window/mainwindow/mainwindowlayoutinfo.cpp
+  window/mainwindow/mainwindowundo.h
+  window/mainwindow/mainwindowundo.cpp
   PARENT_SCOPE
 )

app/window/mainwindow/mainwindowundo.cpp

@@ -0,0 +1,38 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2020 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "mainwindowundo.h"
+
+#include "core.h"
+#include "window/mainwindow/mainwindow.h"
+
+namespace olive {
+
+void OpenSequenceCommand::redo()
+{
+  Core::instance()->main_window()->OpenSequence(sequence_);
+}
+
+void OpenSequenceCommand::undo()
+{
+  Core::instance()->main_window()->CloseSequence(sequence_);
+}
+
+}

app/window/mainwindow/mainwindowundo.h

@@ -0,0 +1,48 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2020 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef MAINWINDOWUNDO_H
+#define MAINWINDOWUNDO_H
+
+#include "project/item/sequence/sequence.h"
+
+namespace olive {
+
+class OpenSequenceCommand : public UndoCommand
+{
+public:
+  OpenSequenceCommand(Sequence* sequence) :
+    sequence_(sequence)
+  {}
+
+  virtual void redo() override;
+
+  virtual void undo() override;
+
+  virtual Project* GetRelevantProject() const override {return nullptr;}
+
+private:
+  Sequence* sequence_;
+
+};
+
+}
+
+#endif // MAINWINDOWUNDO_H