Improve behavior of inline comment dialog
Summary:
Fixes T2669.
- Currently, making an inline comment does not focus the textarea. Instead, focus the textarea.
- Currently, the positioning is kind of buggy. Make it viewport-relative and put the dialog slightly below the inline reticle.
- Use JX.Workflow more and simplify some of the ajax stuff.
Test Plan: Created inline comments.
Reviewers: chad
Reviewed By: chad
CC: aran
Maniphest Tasks: T2669
Differential Revision: https://secure.phabricator.com/D5229