Add MacroSegmentList to allow deselecting items

Previously once a macro segement was selected you could only deselect it
by clicking on different macro segment, thus never allowing the user to
deselect all macro segments

src/headers/advanced-scene-switcher.hpp

@@ -6,6 +6,7 @@
 #else
 #include "ui_advanced-scene-switcher.h"
 #endif
+#include "macro-segment-list.hpp"
 #include "switcher-data-structs.hpp"
 #include "platform-funcs.hpp"
 
@@ -282,6 +283,9 @@ public slots:
 	void on_close_clicked();
 
 private:
+	MacroSegmentList *conditionsList = nullptr;
+	MacroSegmentList *actionsList = nullptr;
+
 	int currentConditionIdx = -1;
 	int currentActionIdx = -1;
 };

src/headers/macro-segment-list.hpp

@@ -0,0 +1,25 @@
+#pragma once
+#include <QWidget>
+#include <QScrollArea>
+#include <QVBoxLayout>
+#include <QLabel>
+
+class MacroSegmentList : public QScrollArea {
+	Q_OBJECT
+
+public:
+	MacroSegmentList(QWidget *parent = nullptr);
+	void SetHelpMsg(const QString &msg);
+	void SetHelpMsgVisible(bool visible);
+	QVBoxLayout *ContentLayout() { return _contentLayout; }
+
+signals:
+	void SelectionChagned(int idx);
+
+protected:
+	void mousePressEvent(QMouseEvent *event);
+
+private:
+	QVBoxLayout *_contentLayout;
+	QLabel *_helpMsg;
+};