This is in addition to Shift + Right-click.
I thik middle mouse feels more natural and is a good permanent solution
to this issue.
Note that this also *allows triggering the context menu from placement
mode*. Until now it's done nothing. This may be annoying to users with
muscle memory but I want to make the change and harvest feedback. I
think showing the context menu is more correct behaviour (although
arguably it should return to placement mode on dismiss?).