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.cpp

@@ -0,0 +1,25 @@
+#include "qt/element/QtSearchBarButton.h"
+
+#include "settings/ApplicationSettings.h"
+
+QtSearchBarButton::QtSearchBarButton(const FilePath& iconPath, bool small, QWidget* parent)
+	: QtSelfRefreshIconButton("", iconPath, "search/button", parent)
+	, m_small(small)
+{
+}
+
+void QtSearchBarButton::refresh()
+{
+	QtSelfRefreshIconButton::refresh();
+
+	int size = m_small ? 10 : 16;
+
+	float height = std::max(ApplicationSettings::getInstance()->getFontSize() + size, size + 14);
+	setFixedHeight(height);
+
+	if (!m_small)
+	{
+		int iconSize = int(height / 4) * 2 + 2;
+		setIconSize(QSize(iconSize, iconSize));
+	}
+}