Summary:
This solves the issue of double-tapping cells when NOT in mobile mode, which is
caused by delayed simulation of click events. (In mobile mode, modern browsers
don't add a delay either way.)
Also avoid unintended opening of the editor by checking that the double-tap is
on the same cell.
Test Plan: Tested manually on iPhone and Chrome emulator.
Reviewers: paulfitz
Reviewed By: paulfitz
Differential Revision: https://phab.getgrist.com/D2727