Add a handle to indicate drag availability on groups

Use case or problem

I was working with the graph groups and wanted drag and drop ability or for paths defined to use the more specific path before using a parent path for color selection.
I did not know that drag and drop was available until I read this forum post: Re-order groups after creation

Proposed solution

A drag indicator/handle would indicate to the user that drag is available.
2 such icons: Google Fonts

Current workaround (optional)

Right now, the tooltip on the color selector button says you can drag to reorder the groups. It’s not visible unless I’m looking at tooltips.

Related feature requests (optional)