This plugin adds a new button that allows a change owner to set a change to Work In Progress, and a button to change from WIP back to a “Ready For Review” state.
Any change in the WIP state will not show up in anyone's Review Requests. Pushing a new patchset will reset the change to Review In Progress.
In addition this plugin exposes this functionality as REST endpoints and SSH command.
Old change screen doesn't support JS API. So that the popup dialog is not shown if “Work In Progress” and “Ready In Review” buttons are used and no comments can be provided. New change screen should be used for best experience with WIP Workflow plugin.