Diagram (issue panel)
Shows one tab per diagram attached to the issue, with a 400px-tall preview beneath. Toolbar offers a sort-tabs toggle, View (read-only full screen), Edit and Add. Each tab has a delete affordance. When the issue has no diagrams, a single "Add Diagram" button is shown. The panel refreshes itself when

#Add a diagram

#Always show panel

#Related
One macro, documented properly.
