Method updateBackground

src/frontend/widgets/LabelWidget.cpp:303–329

! * this function keeps the background color of the TextEdit in LabelWidget in sync with * the background color of the parent aspect. This is to avoid the situations where the * text wouldn't be readable anymore if the foreground color is close or equal to the * background color of TextEdit - e.g., a label with white foreground color on a dark worksheet * and with white background color in Te

 * Called if the background color of the parent aspect has changed.
 */
void LabelWidget::updateBackground() const {
	// if latex or markdown mode is used, use the default palette from the desktop theme
	// since we have additional highlighting for latex and markdown and we don't want it to
	// collide with the modified background color of QTextEdit. Modify it only for rich-text.
	const auto mode = static_cast<TextLabel::Mode>(ui.cbMode->currentIndex());
	if (mode != TextLabel::Mode::Text) {
		ui.teLabel->setPalette(QPalette());
		return;
	}

	QColor color(Qt::white);
	const auto type = m_label->parentAspect()->type();
	if (type == AspectType::Worksheet)
		color = static_cast<const Worksheet*>(m_label->parentAspect())->background()->firstColor();
	else if (type == AspectType::CartesianPlot)
		color = static_cast<CartesianPlot*>(m_label->parentAspect())->plotArea()->background()->firstColor();
	else if (type == AspectType::CartesianPlotLegend)
		color = static_cast<const CartesianPlotLegend*>(m_label->parentAspect())->background()->firstColor();
	else if (type == AspectType::InfoElement || type == AspectType::Axis)
		color = static_cast<CartesianPlot*>(m_label->parentAspect()->parentAspect())->plotArea()->background()->firstColor();
	else
		DEBUG(Q_FUNC_INFO << ", Not handled type:" << static_cast<int>(type));

	QString style;
	style = QString(QLatin1String("QTextEdit{background-color: rgb(%1, %2, %3);}")).arg(color.red()).arg(color.green()).arg(color.blue());
	ui.teLabel->setStyleSheet(style);
}

void LabelWidget::initConnections() {
	while (!m_connections.isEmpty())