Some notes from offline design discussions:
1. We're removing the "tally" at the top of the menu. (3) items selected
2. right-click is an implicit selection of the item and deselects other items on single select and adds to the selected items for shift (multi-select)

Defects:

• When no issue is currently selected the dropdown shows up empty (10px height)
• Right click on an issue when the menu is already open will open a new menu positioned 0x0
• When there are no open sprints it still says Add to Sprint
• Right click on an issue that is not yet selected won't select it and the action then act on the currently selected issue
• No workie on work mode

Right-click a selection of issue(s) in plan mode to open up the context menu. Several actions are implememented (add to sprint, remove from sprint, send to top and bottom of backlog)

on branch GHS-6861-context-menu-spike

Plan is for this to work for both single-select and multi-selected items.