How to zoom and scroll in a Gantt Chart

Here's an elegant trick to use one Gantt Chart to control the scrolling and zooming of another Gantt Chart.

The Gantt chart used to create the scrolling and zooming functionality is only one bar, but we still have sets to cover the resources (one) and jobs (one), parameters for start and duration, element parameters to denote this one bar, and two string parameters to specify the viewport.

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