Method firstColorChanged

src/frontend/widgets/BackgroundWidget.cpp:290–295

}

void BackgroundWidget::firstColorChanged(const QColor& c) {
	CONDITIONAL_LOCK_RETURN;

	for (auto* background : m_backgrounds)
		background->setFirstColor(c);
}

void BackgroundWidget::secondColorChanged(const QColor& c) {
	CONDITIONAL_LOCK_RETURN;