Can't right-click project tree nodes

[peterflynn]

If you right-click any node in the project tree, the menu disappears almost immediately and the node enters rename mode. Looks like a regression caused by PR #7955.

@ryanstewart, fyi

[ryanstewart]

Just submitted a PR for a fix.

[njx]

Oops, missed testing this. It doesn't seem to repro on the Mac, at least with the trackpad. Will look on Windows.

[njx]

FBNC to @peterflynn