made interlacing configurable

project/undo.cpp

@@ -1591,3 +1591,31 @@ void EditSequenceCommand::update() {
 		set_sequence(seq);
 	}
 }
+
+SetInt::SetInt(int* pointer, int new_value) :
+    p(pointer),
+    oldval(*pointer),
+    newval(new_value)
+{}
+
+void SetInt::undo() {
+    *p = oldval;
+}
+
+void SetInt::redo() {
+    *p = newval;
+}
+
+SetString::SetString(QString* pointer, QString new_value) :
+    p(pointer),
+    oldval(*pointer),
+    newval(new_value)
+{}
+
+void SetString::undo() {
+    *p = oldval;
+}
+
+void SetString::redo() {
+    *p = newval;
+}

project/undo.h

@@ -493,4 +493,26 @@ private:
 	int old_audio_layout;
 };
 
+class SetInt : public QUndoCommand {
+public:
+    SetInt(int* pointer, int new_value);
+    void undo();
+    void redo();
+private:
+    int* p;
+    int oldval;
+    int newval;
+};
+
+class SetString : public QUndoCommand {
+public:
+    SetString(QString* pointer, QString new_value);
+    void undo();
+    void redo();
+private:
+    QString* p;
+    QString oldval;
+    QString newval;
+};
+
 #endif // UNDO_H