Comment 1 for bug 1793767

You are right. The middle-alignment, center-alignment issue was a quick-fix in the last days of 5.0-rc. I recall the decision at the time was to make it deterministic (left-most and center-most) instead of picking the middle of the group. But the plan is to eventually update that to align to the element you right-click on. In the case of keyboard shortcut, we would use the first element selected.