Collapse/Uncollapse works only for first Gantt displayed in same page

[Jorge Ortiz]

When having multiple graphs in the same page, the +/- collapse tool might collapse/uncollapse the group in the other graph. The JS onclick event listener seems to look for "span#group_[ticket_id]", which would match the same ticket displayed in another graph (with same, or more likely, different configuration). It seems to only affect the first match found.

I think this would be solved if the graph id "g_[graph_id]" could be prepended or appended to the group id string in the so that it only affects the correct graph.

[Chris Nelson]

I have a partial fix. Working on fleshing it out.

[Chris Nelson]

In 13852:

Handle collapsing groups on multi-Gantt pages. Refs #11489.

Needed to add the chart ID to more DOM element IDs for uniqueness.

[Chris Nelson]

In 13853:

Remove comment that has been addressed. Refs #11489.