Improve the renderign of new and existing discussions
by reducing the number of watchers on each object & array.
Previously every discussion change would trigger an update for every
discussion component.
Also tidied up some components to get them closer to our docs.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51506
This caused many pain points when working with it.
Part of the data was camel cased the other snake case.
Other parts where snake case & then getting converted in components,
this conversion has the potential for leaking memory.
This changes that & makes it consistent with what it returned from the
API, snake case.
This re-implements image commenting in merge request diffs.
This feature was previously lost when the merge request
page was refactored into Vue.
With this, we create an overlay component. The overlay
component handles displaying the comment badges
and the comment form badge.
Badges are displayed based on the position attribute
sent with the discussion.
Comment forms for diff files are controlled through
a different state property. This is so we don't
tie comment forms to diff files directly creating
deep nested state. Instead we create a flat array
which holds the file hash & the X & Y position of
the comment form.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/48956
