ui: made icon buttons self updating on color scheme change

* fixed hatching not replaced in single file view title bar on color scheme change

src/lib_gui/qt/element/QtSearchBarButton.h

@@ -0,0 +1,19 @@
+#ifndef QT_SEARCH_BAR_BUTTON_H
+#define QT_SEARCH_BAR_BUTTON_H
+
+#include "qt/element/QtIconButton.h"
+
+class QtSearchBarButton
+	: public QtSelfRefreshIconButton
+{
+public:
+	QtSearchBarButton(const FilePath& iconPath, bool small = false, QWidget* parent = nullptr);
+
+protected:
+	void refresh() override;
+
+private:
+	bool m_small;
+};
+
+#endif // QT_SEARCH_BAR_BUTTON_H