Right-clicking note then left-clicking board acts like a move

[drhayes]

Repro

1. Go to the preview.
2. Right-click on a card at the bottom of a column so that the browser's right-click menu displays.
3. Left-click above the card (outside the right-click menu).

Expected

The right-click menu disappears, the card stays where it is.

Actual

A move cursor briefly displays, the card jumps to the location of the left-click.