fixed #125

project/undo.cpp

@@ -1488,3 +1488,20 @@ void SetBool::undo() {
 void SetBool::redo() {
 	*boolean = new_setting;
 }
+
+SetSelectionsCommand::SetSelectionsCommand(Sequence* s) :
+    seq(s),
+    done(true)
+{}
+
+void SetSelectionsCommand::undo() {
+    sequence->selections = old_data;
+    done = false;
+}
+
+void SetSelectionsCommand::redo() {
+    if (!done) {
+        sequence->selections = new_data;
+        done = true;
+    }
+}

project/undo.h

@@ -14,6 +14,7 @@ struct Sequence;
 struct Media;
 
 #include "project/marker.h"
+#include "project/selection.h"
 
 #include <QUndoStack>
 #include <QUndoCommand>
@@ -524,4 +525,16 @@ private:
 	bool new_setting;
 };
 
+class SetSelectionsCommand : public QUndoCommand {
+public:
+    SetSelectionsCommand(Sequence *s);
+    void undo();
+    void redo();
+    QVector<Selection> old_data;
+    QVector<Selection> new_data;
+private:
+    Sequence* seq;
+    bool done;
+};
+
 #endif // UNDO_H