Satori: Jumpy context menu if column scroll, on FF

[mccalluc]

• Specific code commit: 2a3c825
• Version of the web browser and OS: ff macos
• Environment where the error occurred: test production

Steps to reproduce

Please list all the actions and the input data used:

1. Bring up Satori
2. In a column which has more rows than there is screen space, click on a node to get a context menu
3. Scroll the column

Observed behavior

• Instead of animating smoothly, in a long continuous scroll, the context menu jumps longer and longer distances to get to the appropriate position.

Expected behavior

• Chrome looks fine... though if the bug even matters, maybe just turn off the context menu when scrolled?