Right-click context menu opens in wrong location

[OJFord]

The right-click context menu only opens in the expected location (at the pointer) if clicked in the left half of the sidebar.

Otherwise it seems to behave as if clicked at the rightmost point of the sidebar at that vertical level. (Which is itself a bit haphazard and inconsistent - depending on the menu's width for example.)

Essentially, the context menu seems to 'see' the entire viewport as being just the sidebar, and respond to clicks outside that, but treating it as a bounding box for where the click event occurred.

Probably a tao bug? Possibly a webkitGTK bug? Not sure, just opening to track. I'm about 70% sure it's newish, as in they used to open in the expected location.