Summary:
Bug summary: if in right bar user starts changing name of column, but then clicks on a different column name in table, THAT column will have its name changed.
This bug occurs because the save method is invoked by a blur event on a input field, which is triggered after all computed observables are calculated. Save method gets an observable to update, which by the time a blur event triggers, is changed to a new column.
The solution was to forcefully trigger the blur event as soon as possible - here by subscribing to the cursor position observable.
Test Plan: Browser tests
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2845