We were rendering the preview in a completely different way from how
we would add the real reply, and the results would be different
sometimes, particularly for multi-line comments with messed-up markup.
Render it server-side instead, in a very similar way to real replies
(generating a DOM list node and transforming it through Parsoid),
although without the whole context of the page to improve performance.
We can remove a lot of client-side code that was used solely for this.
This will allow the preview to accurately display the signatures when
we change how they are added (T278442), without us having to implement
those changes again from scratch for the preview.
Change-Id: I53341f4d4075c25b67ec3b3032bff9b8a880dcd3
For two given revisions, this API tells us which comments have
been added and which have been removed.
Can be used to highlight new comments, or check if the page
has been updated since we first loaded it.
Bug: T281624
Bug: T300504
Change-Id: Ia4d95ffe3b7cf2317cd8e7c0f034e09f64777ef3
Per Manuel Arostegui in T263817#7033384. The limit is 5000.
(I picked it arbitrarily, there's no real rationale for it.)
Also log a warning when any user reaches half of the limit,
so that we might make a decision about changing this mechanism
before it starts affecting users. Maybe at that time we'll
have data to show that it's safe to remove the limit.
Bug: T263817
Change-Id: I18a8ee0ad7383759229c5721d5253fb591457d4d
The existing comment IDs can't be used to find the same comment on
a different revision or page (when it's transcluded), because they
depend on the comment's parent and its position on the page.
Comment names depend only on the author and timestamp. The trade-off
is that they can't distinguish comments posted within the same minute,
or in the same edit, so we will still need the IDs sometimes.
Prefer using comment names when replying, if they're not ambiguous.
This fixes T273413 and T275821.
Heading names depend on the author and timestamp of the oldest comment.
This way we don't have to detect changes to the heading text, but we
can't distinguish headings without any comments.
Bug: T274685
Bug: T273413
Bug: T275821
Change-Id: Id85c50ba38d1e532cec106708c077b908a3fcd49
