Emit resize events after making document changes during inline editing

Summary:
Ref T12634. Fixes T12633. These events allow the keyboard reticle to resize properly.

(I expect to possibly hide/disable the reticle in the future during edits, but at least make the behavior sensible for now.)

Test Plan:

• Used "n" to select a block.
• Clicked a line number in that block to start a new inline comment.
• Saw reticle resize properly.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12634, T12633

Differential Revision: https://secure.phabricator.com/D17904