Roadmap bar edges using fixed/dynamic start and end dates
From #6470 (closed), an epic's chosen planned start and planned end dates can be independently chosen to be fixed or dynamic. Given the choice, the roadmap bar should reflect this.
Ie the start date of the roadmap bar should be the fixed date of the dynamic date of the corresponding epic, depending on the user selected choice. Same for end date.
If the two dates are in conflict (ie start date is after end date), then the bar for this epic should not appear on the roadmap view.