void updateDisplay();

Updates the display.

Normally, the QmlViewPortControl display will automatically update if the viewport of the associated QmlChartViewer object is changed. So calling updateDisplay is not necessary. However, if the display needs to be updated for other reasons, such as if the viewport border color has been modified, this method can be used to notify the QmlViewPortControl that the modification has been completed so that it can update the display.

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