According to Daniel it only worked by accident, and stopped working
after de63ad823abe:
getPageByReference() used to do an opportunistic lookup by ID when given
an instance of PageIdentity -- which is correct for EventDispatcher,
but problematic in the general case, causing T296063.
The correct thing to do here is to use getPageById(), since the canonical
association between revision and page is by page ID.
Bug: T297431
Change-Id: Icc1df0c9ca5345e65ef5f8daf0815013d7db0943
The 'legacyPrimary' links will take you to the section
the comment is in and should be used when you don't have
access to comment IDs.
Bug: T296018
Change-Id: I944feb90e7c3a69f81366f42fa110c58cac26dbb
This reverts commit 99b757465a.
Reason for revert: We may never need the 'behind-overlay' setting
and it is untested and probably broken.
Bug: T295816
Change-Id: I9e128862271697ece5241d0e98727174b42f54ff
* Add a N/A value for edit counts from anonymous users
* Only oversample with $wgDTSchemaEditAttemptStepOversample if the edit
is from DiscussionTools
* Consider $wgWMESchemaEditAttemptStepOversample for oversampling
Bug: T286076
Bug: T295995
Depends-On: Ieb3f6c6e1775c1ef53747c37003b17e3634d1c44
Change-Id: I91245a61dfbde8b5ec9b2893b9170cc4d73f7b0a
When our interface initialized on a page that the current user
recently edited (using the reply tool, the full-page source editor,
or any other way), check if any new automatic topic subscriptions
were added and update the interface to reflect that.
This requires doing some API requests after the page is loaded,
because adding auto-subscriptions happens asynchronously in a
DeferredUpdate (potentially after the user is already viewing
the page with their comment saved), and depends on the contents
of the edit.
(When using the reply tool, we could avoid this API request and
replicate the logic, but that's not implemented in this commit
to keep it simple.)
Bug: T284836
Change-Id: Ic0fabda0de4ebbc5e424f49641e6b03ebb4b7e6a
Usually this isn't a problem, because the comments are marked as
template-generated and we don't allow replying to them. But we had a
special case where we were trying to skip over some invisible
elements, which was causing us to skip into the middle of the
about-group in some cases. When Parsoid sees that, it serializes the
contents twice.
Bug: T290940
Change-Id: I9fe0b8d43ab874ccef371990799f77bfc46bc954
We do something similar in CommentItem.js with a moment object.
The object can be converted to a string when required.
Change-Id: Id7221e9201db0d89c3b771574634c878c9515ca0
* Use featuresEnabled.newtopictool to decide when new topic
links might exist on the page, instead of relying on
`#ca-addsection` existing. Change the logic of that feature
flag to check if __NONEWSECTIONLINK__ is on the page.
* Render the add-topic button locally in a hook to replace
the one suppressed by onMinervaNeueTalkPageOverlay. Do so
whenever the newtopictool feature is enabled (see above).
Bug: T270537
Change-Id: I3e3f7403b3b86bb84fcb75a8833919512519b70f
This should avoid them showing up in unexpected contexts where parser
output is used (e.g. API T292345, search T294168, action=render).
Also rename some variables to be directionality-neutral.
Bug: T292345
Bug: T294168
Change-Id: Ibcac44ee10f0842e205d9dd9a7f3a935ce0c690b
* Explode boundary point tuples passed to computePosition
* Note that we won't use previousSibling instead of array_reverse
* Simplify logic using xor
Change-Id: I927256e31b5e441aade91b4fd0d83d8f0d89afbe
This doesn't sort by the topic name, but the hidden
sub_id field, leading to a confusing order.
Bug: T273342
Change-Id: I6146abf05544d40c9ef0d2e8c58d020e5a5fa8a2
We always do our processing in the parser now, so we don't need the
marker comment to detect whether we've already processed the page.
Bonus: include the time taken by our processing in the limit report.
Bug: T291831
Change-Id: Ife7ddffbad1b1495b004739212002a98fdebe6c0
The PHP DOM extension measures lengths and offsets in Unicode codepoints.
Our PHP code used UTF-8 bytes, causing some offsets to be slightly off.
Now it mostly uses Unicode codepoints as well (we're forced to use bytes
in a few places, because preg_match returns offsets in bytes).
In practice, this had no visible effect to the user. It caused the
markers `<span data-mw-comment-end="..."></span>` to be placed at
the end of their container instead of the correct position when the
timestamp contained multibyte characters (e.g. "ź" in Polish); but
the correct position is usually at the end of the container anyway.
In the test cases, the only difference is placing these markers before
a trailing line break inside `<p>...</p>` tags rather than before it.
The patch also accidentally fixes another bug, where element nodes
with no children (mostly <img>) were incorrectly excluded when calling
cloneContents(), because they were treated as if they were text nodes.
Change-Id: Iccdccf1078598f4b62cab96225e9c85a4c0e93ee
They were spread across several places, and some of them were checking
different things, causing us to show the view mode on some
action=edit&redlink=1 links but without showing our empty state.
Bug: T291085
Change-Id: Id1864e58c47dbd22abb41d48e31f81318d9f94f9
If the user talk edit or mention coincides with exactly one new comment:
* Change the primary link to be a direct link to the comment
* Add a text snippet to notifications that don't already include one
(user talk edits that are not new sections).
This is done for all such notifications, regardless of whether anyone
has topic subscriptions enabled.
Bug: T281590
Bug: T253082
Change-Id: I98fbca8e57845cd7c82ad533c393db953e4e5643
Last changed in March (4a0802065c),
was only needed for about 2 weeks for compatibility with cached data.
Change-Id: I510238cb86a7b4d7ae5e8636716d1e9ca2d0e402
I guess that at some point this class was meant to convert some
timestamps, but it does not (it returns them as strings in the
database format).
Change-Id: I33ee5e8807ee686b77819ef16f43509326c60762
$user is guaranteed to be a User object.
Also, while we're here:
* Remove an unnecessary TODO. There's no need for a more specific
error message, this one is just fine, other extensions use it too.
* Replace isAnon() with !isRegistered(). It'll probably be deprecated
soon, because the new UserIdentity interface doesn't include it.
Change-Id: Ifbe98f4eccef79deee6bdb54c1bccf49807a9563
This approach is used in our new topic tool empty state code and is
much nicer. Also fix typo in a comment nearby.
Change-Id: I80755ef0960a172b0f370c36c1979a86498d6fa9
For automatic topic subscriptions, I plan to introduce a third
subscription state to indicate them. This patch includes minor tweaks
I wanted to add while working on that:
* Introduce constants instead of numbers
* Remove a TODO that doesn't seem like a good idea any more
* Remove a `"length": 1` on sub_state that did not do anything
(but it might have been meant to indicate that it was supposed
to be a boolean, which would be wrong)
Bug: T284836
Change-Id: I6e6096968ad38510102287bccd349090b6ca4280
Notifications are bundled by section, so instead of linking to the
comment, link to the section.
Additionally, add a parameter to the URL listing all the comment IDs
from the bundle, and highlight them all and scroll to the topmost one.
Having to handle both URL fragments and URL query parameters makes
this code kind of a mess :(
Also, some unexpected changes became necessary:
* EventDispatcher.php: Store the section title in events using
HeadingItem::getLinkableTitle() instead of ThreadItem::getText().
The result is mostly the same, except in case of wacky markup like
images or extension tags. We can more reliably use it to link to the
section on the page, and we already use getLinkableTitle() when
generating edit summaries in the reply tool for this reason.
* dt.init.less: Change the mix-blend-mode for the highlights from
'multiply' to 'darken', so that multiple overlapping highlights do
not look more opaque. This affects how the highlights look on
non-white backgrounds and images (they're less blue, and on darker
backgrounds entirely invisible), but it seems worth it.
Bug: T286620
Change-Id: I21bb5c003abc2747f0350d3f3af558dfb55693e9
The code (prior to d25825a754) assumed
that level 3+ headings would always follow a level 2 heading or the
placeholder heading, but we don't generate a placeholder heading if
there are no comments in section zero.
Add more tests to confirm that comments under level 3+ headings (that
are not sub-headings of level 2), and level 1 headings, are ignored
when generating notifications, and do not mess with normal headings.
Bug: T288775
Change-Id: Ic57b56752a4797cb01234f66e0ed7b849752bd70
Dependency injection is now available to actions,
extension already requires MW 1.37+
Bug: T253078
Change-Id: I473abac19ed5e6f3c6706797e91704ff635f64c6
This DOMDocument property has no effect, because we do not use
DOMDocument methods for parsing HTML, but rather DOMUtils::parseHTML()
provided by Parsoid.
Change-Id: I1d9e73e53f2d44f41cf9dcda4f06ac8647671096
This should only affect some edge cases like the project namespace (e.g.
Wikipedia:Village_pump isn't a talk page, but does get discussiontools.)
Bug: T288317
Change-Id: I509101063a1d64d09cff71a84bf48c69ab7a8c08
This includes the dtrepliedto URL functionality from
I3f81e4d77faed367606e47678b8896051982359d.
Bug: T274831
Bug: T274832
Bug: T277329
Change-Id: I035d04f30c8312b0cb42902d3bf940df1482ffb3
Use `DOMCompat::getBody( ... )` as a nicer getter than
`->getElementsByTagName( 'body' )->item( 0 )`.
Remove overly defensive checks and redundant annotations on its
return value. Since we're dealing with HTML documents throughout,
the document body is guaranteed to exist.
We previously needed some of them to convince Phan when it thought
the body may be null, but this seems to no longer be needed.
Change-Id: If7aee7b6adbfa78269c7ba28b26a6eaa21fe935b
Use DOMCompat::querySelectorAll() instead.
CommentModifier::isHtmlSigned()
* Copied the CSS selector from the JS equivalent function.
CommentUtils::unwrapParsoidSections()
* Copied the CSS selector from the JS equivalent function (in VisualEditor).
CommentItem::getMentions()
* Trivial.
This causes Phan to report some more issues, which are also fixed.
Follow-up to 25272e7a4a.
Change-Id: Iaf1222f7114916f2eca19942c3686168899486fd
We can just use insertBefore() normally. There was never a PHP bug,
but rather a Phan bug, and it no longer affects us.
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/DiscussionTools/+/596813/70/includes/ImmutableRange.php#373
This reveals a bug in CommentParser where it sometimes produces
incorrect ranges (we were incorrectly treating `false` like `null`,
hiding the issue). I'll fix it in a separate commit.
Follow-up to 25272e7a4a.
Change-Id: I4afba38f1d82ddbf8732bfe3e4d4f6ebe2f8de5d
In case 4 and case 6, no notifications are expected. In all other
cases we now get the expected notifications.
Bug: T285528
Change-Id: I9e813bb3a053bc1232783f9eae1ad75672b4fa7e
These changes ensure that DiscussionTools is independent of DOM
library choice, and will not break if/when Parsoid switches to an
alternate (more standards-compliant) DOM library.
We run `phan` against the Dodo standards-compliant DOM library,
so this ends up flagging uses of non-standard PHP extensions to
the DOM. These will be suppressed for now with a "Nonstandard DOM"
comment that can be grepped for, since they will eventually
will need to be rewritten or worked around.
Most frequent issues:
* Node::nodeValue and Node::textContent and Element::getAttribute()
can return null in a spec-compliant implementation. Add `?? ''` to
make spec-compliant results consistent w/ what PHP returns.
* DOMXPath doesn't accept anything except DOMDocument. These uses
should be replaced with DOMCompat::querySelectorAll() or similar
(which end up using DOMXPath under the covers for DOMDocument any way,
but are implemented more efficiently in a spec-compliant
implementation).
* A couple of times we have code like:
`while ($node->firstChild!==null) { $node = $node->firstChild; }`
and phan's analysis isn't strong enough to determine that $node is still
non-null after the while. This same issue should appear with DOMDocument
but phan doesn't complain for some reason.
One apparently legit issue:
* Node::insertBefore() is once called in a funny way which leans on
the fact that the second option is optional in PHP. This seems to be
a workaround for an ancient PHP bug, and can probably be safely
removed.
Bug: T287611
Bug: T217867
Change-Id: I3c4f41c3819770f85d68157c9f690d650b7266a3
For compatibility with Parsoid's document abstraction (Parsoid may
switch to an alternate DOM library in the future), don't explicitly
create a new document object using `new DOMDocument`; instead use
the Parsoid wrapper `DOMCompat::newDocument()`. This ensures that
the Document object created will be compatible with Parsoid.
There are a number of other subtle dependencies on the PHP `dom`
extension in DiscussionTools, like explicit `instanceof` tests; those
will be tweaked in a follow-up patch
(I3c4f41c3819770f85d68157c9f690d650b7266a3) since they do not affect
correctness so long as Parsoid is aliasing Document to a subclass of
the built-in DOMDocument. Similarly, the Phan warnings we suppress
do not cause runtime errors (because of the fixes included in
c5265341afd9efde6b54ba56dc009aab88eff83c) but phan will be happier
once the follow-up patch lands and aligns all the DOM types.
Bug: T287611
Depends-On: If0671255779571a91d3472a9d90d0f2d69dd1f7d
Change-Id: Ib98bd5b76de7a0d32a29840d1ce04379c72ef486
The user interface only allows you to subscribe to level 2 headings.
But we would generate events for whatever heading was the closest,
If it was e.g. level 3, no one would receive that notification.
Now we generate events for the closest level 2 heading, or we don't
generate the event at all if there isn't one (if the only headings are
of level 3 and below, or level 1, or if the comment is added before
the first heading on the page).
Bug: T286736
Change-Id: Iae99853070e353ab81c9cc29ef1d53c877adfc66
We used an internal API requests to fetch page content because it was
easy, but there's no way to guarantee that it returns data from the
primary database.
Use ParserOutputAccess::getParserOutput() to fetch from cache if
available. Also, use canonical output instead of user-specific,
not that it should matter.
Bug: T285895
Change-Id: I7dcd9659be77746dc2a0c4eeae2319887936b555
…without making the topic subscriptions feature available in user preferences.
Follow-up to these commits, which added these checks in ad-hoc ways:
* 9420f22e9d
* f3422f40a6
* 23a490deca
* a555db7892
Bug: T284491
Change-Id: If2e3fb1e06d1cc489fbca14796ed77c83bb52991
If the revision from which we generated the notification has been
deleted, we shouldn't include the content snippet, nor the direct link
to the comment (because the fragment ID is generated from the content).
This matches how Echo handles mention notifications.
Change-Id: Ica939f3a4efd39d0c295511d58280d3f9d584129
As it happens, most of Echo does not actually parse this message,
but it is for some reason parsed in HTML email notifications.
Change-Id: I414cd242d9bcc4d8b5a1c2a2a71be9e5f00ea8be
We don't display [subscribe] buttons on your user talk page,
but the API still allows those subscriptions.
Use the same approach as for mentions to ensure this doesn't cause
duplicate notifications.
Remove some code in SubscribedNewCommentPresentationModel,
now guaranteed to be unused.
Change-Id: I99a276a48d8562552ed2c54cc0323e8e428845fd
Otherwise, the global context is used (RequestContext::getMain()),
which is undesirable when you're building a rubegoldbergian
contraption and we're already inside an internal action API request
with a fake context.
Change-Id: I01daf8dc70b5751bc1e157fe598988cd5d3219e5
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
Using `updateCacheExpiry()` in this way appears to be established
with examples of other use in WMF production such as:
- CategortyTree extension:
custom cache expiry for pages with `<categorytree>`.
- RSS extension:
custom cache expiry for pages with `<rss>`.
- intersection extension:
custom cache expiry for pages with `<DynamicPageList>`.
- Math extension:
custom cache expiry if `<math>` failed.
- Wikibase extension, Flow extension:
no caching for certain namespaces or content types.
- Graph extension, Kartographer extension:
via onParserAfterParse hook, no caching if on preview.
Bug: T280605
Change-Id: Iea41ab8599ffae4622c97d682258b1b64eaf9ba2
Previously we relied on the NamespaceInfo check below to reject
special pages, but after commit 07d885248bc54bdc0f12d9745916c794d45ec81c
in MediaWiki core, PageProps throws an exception when called with a
special page.
Bug: T281180
Depends-On: I32c94107fde96b9d6344c77b621be9b3b9b7faaf
Change-Id: I0fd893c63a6e92f6c84e7aa92270852e1137fcad
The issue occurred when replying to a comment consisting of multiple
list items, starting with a <dt> (instead of the expected <dd>), so
that the comment is considered to be unindented.
Modifier tried to add the reply directly inside the list (<dl>) rather
than inside the last list item (<dt>), which caused it to be confused
about indentation levels and try to un-indent more times than there
were indentations.
The simplest solution, given the existing code, is to add the reply
outside the list instead, in a new list. This results in a "list gap"
(<dl><dt>...</dt><dd>...</dd></dl><dl><dd>...</dd></dl>), but I think
it's acceptable for this rare case.
There are separate tests cases for old Parser and for Parsoid HTML,
because they parse the original wikitext differently (with the old
Parser producing HTML with a list gap too).
Bug: T279445
Change-Id: Ie0ee960e7090cf051ee547b480c980e9530eda51
The regexps needs to be non-greedy, otherwise it could swallow up a
large chunk of the page (up to the next comment).
I noticed this when adding tests for this code, in the 'unclosed-font'
test case (Ief9648b8805fadcc170c54b627eb669cc8b907b6).
Change-Id: I5f67a9599b0cb07bdd53abeebac9ada221181b66
If curLevel or desiredLevel are calculated incorrectly, this loop
could never end.
In JS, something would throw an exception before going infinite, but
PHP is happy to trot along despite accessing properties of null and
attaching multiple children to a document node.
Bug: T279445
Change-Id: I1784f550ec3a23dcded4f2b1def97e51cb414b7b
We added it because the initial designs for the subscribe action were
much easier to implement like this, and topic "containers" (T269950)
would have required it.
However, the latest design of the subscribe action will not need it
(T279149), and topic containers are still very far away, so let's
remove it for now.
Bug: T280433
Change-Id: I21a23e9bea43f24d265750926fbd62b99038d3f1
The 'dtenable' does not appear to take user-provided content that
requires language normalization. In general getRawVal should be used,
or if it's user input that needs normalization, use getText(). Perhaps
one day we'll alias or deprecate getVal (which is currently an odd
mid-way hybrid, most closely to getText; originally created for
EditPage.php textareas).
Change-Id: I8364c84f8c4f700da6e208df2e87c29bf254d685
We can't allow it, because the required database tables may not exist
yet (T280082).
This is meant to be temporary until we complete DBA review and the
tables are created.
Bug: T280082
Change-Id: I8f947b779c6829763d3413931c6d354e6f7aee4d
As of 7ad6328223, we also use this data
to check whether comments exist on the page, not only whether they're
transcluded.
Follow-up to 42ce942c86.
Bug: T275821
Bug: T273413
Change-Id: I95eb85354e7b84cc10ab703d28315d0667696f4c
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
Longer, but follows the style guide and less likely to conflict.
We need to account for init classes in the cache being around for
a while.
Change-Id: I738bc93393850db320fdbda2b003ca8ac40556da
Now it detect signatures generated by en.wp's {{Undated}} template,
and signatures of people who do weird stuff to the timestamps.
Bug: T275938
Change-Id: I27b07f6786ca5433a3c02a5fe68e4716d41401bb
In some cases it would return the parent node, instead of the siblings
it should return.
It's a private method only called by getFullyCoveredSiblings(), and
that method had a bug that cancelled out this one, so everything
worked correctly. But I want to use it elsewhere now and ran into it.
Change-Id: Ic12f007d57a8502a1bea5f0af17b29e9d59093d6
The horrendous 11-line if() condition did not correctly handle
signatures wrapped in inline formatting markup, like <small>.
Instead, implement this logic in the code for skipping to the end
of a paragraph, which didn't exist yet when that condition was
added, but seems like a much better place to check this now.
Bug: T275934
Change-Id: I5cccff889b5e15b5f8fde0538bf4bccb22e762cf
We may need this for topic subscriptions, and it seems
generally useful to include in the API response anyway.
Change-Id: If9522dc0c79a9a9ffb3a80f83fb17bf3c9399d6d
This code expected $container->firstChild to be a
<div class="mw-parser-output">, but that element is not present
when we're running on HTML to be saved in parser cache.
We ended up inserting the marker inside whatever node was the
first on the page, and if it was a <style> element, both our
marker and the styles would be lost when serializing, like in
6c7a0ca9a2.
When we're running on final HTML, the marker will now be outside
of <div class="mw-parser-output">, but that seems to be fine. Only
early versions of I4e60fdbc098c1a74757d6e60fec6bcf8e5db37c1 had
problems with that (see comments on patchset 41), but it works now.
The added test case also covers the fix for T274709.
Bug: T275440
Change-Id: I38d45dd8686919be51e1d307ded12b0afe185eb5
* HookUtils:FEATURES lists all features
* CommentFormatter::USE_WITH_FEATURES are all features
which require the comment formatter
Change-Id: Idbbe8bdd910b9c7b23c7fee76af7bb7ee13c2759
Going forward this will allow us to remove the parser
cache split, and toggle features just using CSS.
The CSS will be modified in a later commit to give the
anon caches time to clear.
Bug: T273072
Change-Id: I83c84b8bc63e1881e07b49acd8499b811adfccd4
I found this error in our logstash. I was not able to find an
existing Phabricator ticket.
Note how line #348 extracts the last element from the
$siblings array. It uses the function end() there, which
returns false in case the array is empty. $siblings[0] can't
do this but yields an error.
An alternative is to use reset(), which can return false as
well. But that's not really better. Especially not better
readable, I would argue.
Change-Id: Ic90cd2392ede15078ba0d5b4d67b8dc5d05f9bf7
Yes, this is still needed, removing it causes failures in tests
(and the old outputs look better).
Change-Id: I5bcedb0295a1f0ac4f6e51eaa9a9e072d8236f3c
Top-level comments that start or end with a list (inconsistent
indentation) would not have triggered the logic for detecting
wrappers.
Bug: T273692
Change-Id: Idcb4eed73e391f5f86eca2eb05cb3cea0d86f30a
* Ignore rendering-transparent nodes between discussion comments.
* Improve isRenderingTransparentNode() so that <link> nodes
representing TemplateStyles are not considered transparent,
otherwise this would undo ae920b831f.
Using a regexp from Parsoid.
Bug: T272746
Change-Id: I0b3c3251156ba6c4826abf5ba44ea93f80ebc01d
Splits the cache on the reply links feature being enabled
for a particular user and title.
An additional check is done after parsing in case the user
has the feature enabled via query string or cookie.
Bug: T267404
Depends-On: I883a37fd67108243e7a20683b1a5d59fd0f6e39f
Change-Id: I3bc06ca7d4aea7f0fe39eef0e77ad88d1f9c1043
Add yet another tree walking utility: CommentUtils::linearWalk().
Unlike TreeWalker, it allows handling the beginnings and ends of nodes
separately – kind of like parsing a XML token stream, or kind of like
VisualEditor's linear model.
(Add unit tests for this utility. The simple.html test case is copied
from [VisualEditor/VisualEditor]/demos/ve/pages/simple.html.)
Use this utility to stop skipping when we reach either a closing or
opening block node tag. Previously we'd skip over such tags inside
nested "transparent" nodes (like <a>, <del>, or apparently <font>).
Bug: T271385
Change-Id: I201a942eb3a56335e84d94e150ec2c33f8b4f4e0
The tool may go in and out of beta as new features
are release/graduated to opt-out. Users should only
need to opt in to the beta feature once to get all
future sub-features.
Bug: T272071
Change-Id: If6834b7fc07fc7e84757dc5fdcea814cd0d65936
Don't assume a feature is available because the code has
loaded and the user option is set. Export the logic from
Hooks.php to the client.
Change-Id: Ica0e58de7ed0d59e3b09645193eb2b691ae41c39
If DiscussionToolsABTest is enabled (set to `all` or a feature), logged
in users who have never used the tool before will be assigned to an a/b
test bucket. If they're in the test bucket, they get the feature
enabled.
If they manually set their beta feature preference, we don't override
that but do maintain their bucket for logging purposes.
Bug: T268191
Change-Id: I9c4d60e9f9aaef11afa7f8661b9c49130dde3ffa
1. Extend the JS modifier to allow adding top-level comments
(that is, replies to headings). PHP modifier doesn't do this
because we'll save the changes using paction=addtopic instead.
2. Subclass CommentController to allow adding a new heading and a
top-level comment underneath it at the same time.
3. A lot of ugly code in ReplyWidget to customize the interface
for this case. Much of it should probably be moved to
CommentController/NewTopicController.
Bug: T267595
Change-Id: I9c707bb7f7aae1b92c72fb4dee436490f8c8409b
