I started using Ganttlab and found it very useful.
This merge request adds new chart to the milestone page.
Highlights:
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The new (top) chart displays the gant in a milestone level (color blue).
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The tasks chart is at the bottom of the page, and displayed the tasks (color green) filtered by the 'selected' milestone.
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When clicking on the Milestone chart is opens the milestone page at the gitlab.com web page
I found it very helpful to view and manage my team tasks at "high level" therefore I use the milestone level.