[JH] Show project Keywords 'window', "Add/Remove" context menu, does not work correctly.

Here’s what I’m seeing:

Add some keywords to a document from the Inspector.
Show project Keywords.
Right click on a keyword that’s in that document, click “Remove keyword from selected documents.”
Does not work.
Click on another document.
Click back on the first document.
Show project Keywords.
Right click on a keyword that’s in that document, click “Remove keyword from selected documents.”
Now it works.

Video showing the problem at https://drive.google.com/open?id=1bc4cn4pRwDWMYpRTKi62vFHx24Qugu9P.

Not a gamebreaker; the use case is likely not common.