Meta topic: https://meta.discourse.org/t/secure-media-uploads-expire/140894
This fixes the issue where if secure media was enabled, audio
and video files would do an initial load using the presigned
URL for the media to get metadata information e.g. duration of
track/video. However this started the expiry countdown for the
URL, so when a user pressed play on the media after 15 seconds
the media would be expired and AWS would return a 403 error.
We do not preload media if secure media is enabled. Otherwise
we just set the preload type to "metadata" which is the browser
default anyway.
The commit: 75069ff179
allows users to remove their primary group, but this introduced a bug
where if you were to edit any other profile info like location or
website which is a form on a separate page then the flair dropdown,
would cause the selected flair to be removed.
This fix ensures that if the `primary_group_id` parameter is missing
from the update payload it does not remove the existing
`primary_group_id`. It will only remove the `primary_group_id` if it is
present in the payload and empty.
This is not used in core or official plugins, and has been printing a deprecation notice since v2.3.0beta4. All OpenID 2.0 code and dependencies have been dropped. The user_open_ids table remains for now, in case anyone has missed the deprecation notice, and needs to migrate their data.
Context at https://meta.discourse.org/t/-/113249
* FIX: Properly convert quotes to Markdown
When quoting a quote it used to convert the quote header, including the
user avatar and username, into a image and some text and then the
contents. This also caused issues when quoting full paragraphs (or when
selecting paragraphs by triple-clicking) because the user avatar and
name from the following quote would also be included.
This commit implements the support necessary to convert
<aside class="quote"> elements to proper Discourse quotes.
Commit aa24be1 made it possible to build data attributes from image's
Markdown and this changes ensure that the resize controls still work
when data attributes are present.
Previously, `notify_first_post_users` was loading all users into memory simultaneously, which can cause Sidekiq to run out of memory for large sites. `notify_post_users` was loading every user one-by-one in a loop.
This commit makes both these functions load users in batches of 100. This should make the memory usage of `notify_first_post_users` lower, and reduce the number of queries required in `notify_post_users`.
Extracted from #8772
This will allow developers (in rails development mode only) to log pre-loaded JSON app data to the browser console for inspection.
When a tag is restricted to a secured category that the user can't see,
the message was saying that it wasn't restricted to any categories.
Now it will say it's restricted to categories you can't access.
* DEV: Use Ember 3.12.2
* Add Ember version to ThemeField's DEPENDENT_CONSTANTS
* DEV: Use `id` instead of `elementId` (See: https://github.com/emberjs/ember.js/issues/18147)
* FIX: Don't leak event listeners (bug introduced in 999e2ff)
Our current algorithm for picking the number of notifications to display
when expanding the notifications relies on magic numbers.
Previously we only allowed for header and an estimate of maximum height of
notification container, this is not ideal as there is padding at the bottom
and top of the notification container
This adds a special number for padding.
The longer term fix though is to render the notification panel off screen
then grab the correct count, finally adding it back into view with.
This would allow for large fonts, small fonts, custom themes and much more.
This reverts commit 7133fd8c89.
Unfortunately performCheckSize may have certain situations in topic
navigation where it is unsafe to call.
We need to add som more safety here prior to merging.
This fix ensures that the site setting `post_edit_time_limit` does not
bypass the limit of the site setting `min_trust_to_edit_post`. This
prevents a bug where users that did not meet the minimum trust level to
edit could edit the title of topics.
Previously it would go to the "html" page when refreshing on the "css" page, and would open an invalid empty-state page when trying to go to the "email style" tab when already on it.
This also enables`@action` use in plugin connectors.
Setting `actions` earlier allows `setupComponents` to use them, for example, when setting up event listeners.
Those are the same arguments that are passed into `after-d-editor` outlet. This will enable plugins that attach to editor preview to be conditionally enabled, usually only for the composer.
Plugins that will use this: discourse-canned-responses, discourse-zoom.
Previously you'd get a server side generic error due to a password check
failing. Now the input element has a maxlength attribute and the server
side will respond with a nicer error message if the value is too long.
If our reply tree somehow ends up with cycles or other odd
structures, we only want to consider a reply once, at the first
level in the tree that it appears.
* DEV: Add data-notification-level attribute to category UI
* Show muted categories on the category page by default
This reverts commit ed9c21e42c.
* Remove redundant spec - muted categories are now visible by default
It seems in some situations replies have been moved to other topics but
the `PostReply` table has not been updated. I will try and fix this in a
follow up PR, but for now this fix ensures that every time we ask a post
for its replies that we restrict it to the same topic.
This commit adds support for an optional "logout" parameter in the
payload of the /session/sso_provider endpoint. If an SSO Consumer
adds a "logout=true" parameter to the encoded/signed "sso" payload,
then Discourse will treat the request as a logout request instead
of an authentication request. The logout flow works something like
this:
* User requests logout at SSO-Consumer site (e.g., clicks "Log me out!"
on web browser).
* SSO-Consumer site does whatever it does to destroy User's session on
the SSO-Consumer site.
* SSO-Consumer then redirects browser to the Discourse sso_provider
endpoint, with a signed request bearing "logout=true" in addition
to the usual nonce and the "return_sso_url".
* Discourse destroys User's discourse session and redirects browser back
to the "return_sso_url".
* SSO-Consumer site does whatever it does --- notably, it cannot request
SSO credentials from Discourse without the User being prompted to login
again.
This new iteration of select-kit focuses on following best principales and disallowing mutations inside select-kit components. A best effort has been made to avoid breaking changes, however if you content was a flat array, eg: ["foo", "bar"] You will need to set valueProperty=null and nameProperty=null on the component.
Also almost every component should have an `onChange` handler now to decide what to do with the updated data. **select-kit will not mutate your data by itself anymore**
If someone only had security keys enabled, the icon to say they had 2FA enabled would not show in the admin staff user list. It would only show if they had TOTP enabled.
This fixes a bug which caused '{{#unless var}}' to act the same as
'{{#if true}}' because 'unless' was transforming the conditional value
to 'undefined'.
For example /t/ URLs were being replaced if they contained secure-media-uploads so if you made a topic called "Secure Media Uploads Are Cool" the View Topic link in the user notifications would be stripped out.
Refactored code so this secure URL detection happens in one place.
When 'categories topics' setting is set to 0, the system will
automatically try to find a value to keep the two columns (categories
and topics) symmetrical.
The value is computed as 1.5x the number of top level categories and at
least 5 topics will always be returned.
If using {{#if showFooter}} in a template, showFooter is never set to true on a group's g/groupname/activity/topics route (it's correctly set on other group routes like group-activity-posts)
Basically, say you had already downloaded a certain image from a certain URL
using pull_hotlinked_images and the onebox. The upload would be stored
by its sha as an upload record. Whenever you linked to the same URL again
in a post (e.g. in our case an og:image on review.discourse) we would
would reuse the original upload record because of the sha1.
However when you turned on secure media this could cause problems as
the first post that uses that upload after secure media is enabled
will set the access control post for the upload to the new post.
Then if the post is deleted every single onebox/link to that same image
URL will fail forever with 403 as the secure-media-uploads URL fails
if the access control post has been deleted.
To fix this when cooking posts and pulling hotlinked images, we only
allow using an original upload by URL if its access control post
matches the current post, and if the original_sha1 is filled in,
meaning it was uploaded AFTER secure media was enabled. otherwise
we just redownload the media again to be safe, as the URL will always
be new then.
Regression was created here:
https://github.com/discourse/discourse/pull/8750
When tag or category is added and the user is watching that category/tag
we changed notification type to `edited` instead of `new post`.
However, the logic here should be a little bit more sophisticated.
If the user has already seen the post, notification should be `edited`.
However, when user hasn't yet seen post, notification should be "new
reply". The case for that is when for example topic is under private
category and set for publishing later. In that case, we modify an
existing topic, however, for a user, it is like a new post.
Discussion on meta:
https://meta.discourse.org/t/publication-of-timed-topics-dont-trigger-new-topic-notifications/139335/13
Previously the badge was granted one month after the last time the badge was granted. The exact date shifted by one day each month. The new logic tries to grant the badge always at the beginning of a new month by looking at new users of the previous month. The "granted at" date is set to the end of the previous month.
Adds a new route `/u/{username}/card.json`, which has a reduced number of fields. This change is behind a hidden site setting, so we can test compatibility before rolling out.
With this change the script:
* Actually removes original large-sized images
* Doesn't save processed files if their size has increased
* Prevents inconsistent state
* DEV: Remove `.large-image` selector
This selector is no longer used in core and there's no reference to it in any of `all-the-plugins`.
* FIX: Adjust the broken image placeholder border
When pull_hotlinked_images tried to run on posts with secure media (which had already been downloaded from external sources) we were getting a 404 when trying to download the image because the secure endpoint doesn't allow anon downloads.
Also, we were getting into an infinite loop of pull_hotlinked_images because the job didn't consider the secure media URLs as "downloaded" already so it kept trying to download them over and over.
In this PR I have also refactored secure-media-upload URL checks and mutations into single source of truth in Upload, adding a SECURE_MEDIA_ROUTE constant to check URLs against too.
* FEATURE: Replace existing badge owners when using the bulk award feature
* Use ActiveRecord to sanitize title update query, Change replace checkbox text
Co-Authored-By: Robin Ward <robin.ward@gmail.com>
Co-authored-by: Robin Ward <robin.ward@gmail.com>
* UX: Invalid CSV error message now includes information about the malformed line
* Update config/locales/server.en.ym and use line_number instead of lineno
Co-Authored-By: Robin Ward <robin.ward@gmail.com>
Co-authored-by: Robin Ward <robin.ward@gmail.com>
Add TopicUploadSecurityManager to handle post moves. When a post moves around or a topic changes between categories and public/private message status the uploads connected to posts in the topic need to have their secure status updated, depending on the security context the topic now lives in.
For consistency this PR introduces using custom markdown and short upload:// URLs for video and audio uploads, rather than just treating them as links and relying on the oneboxer. The markdown syntax for videos is  and for audio it is .
This is achieved in discourse-markdown-it by modifying the rules for images in mardown-it via md.renderer.rules.image. We return HTML instead of the token when we encounter audio or video after | and the preview renders that HTML. Also when uploading an audio or video file we insert the relevant markdown into the composer.
Let's say post #2 quotes post number #1. If a user decides to quote the
quote in post #2, it should keep the information of post #1
("user_1, post: 1, topic: X"), instead of replacing with current post
info ("user_2, post: 2, topic: X").
When editing site texts from
/admin/customize/site_texts/
you can edit badge titles (aka name) and this will update any users that
have that badge currently set as their title. This fix prevents a badge
description text from being set as their title if an admin updates the
badge description text or any other badge fields that aren't the title.
The data-vocabulary.org schema is being deprecated.
We're now using the BreadcrumList data from the latest and greatest schema.org.
FIX: categories_breadcrumb helper to support more than 2 levels of categories.
- Increase size of textarea when displaying generated codes
- Adjust maxlength of input field in JS UI
- Adjust maxlength of input field in no_ember UI
Follow-up to bff9880d63
On some customer forums we are randomly getting a "You must select a valid user" error when sending a PM even when all parameters seem to be OK. This is an attempt to track it down with more data.
There is a feature, that when tag or category is added to the topic,
customers who are watching that category or tag are notified.
The problem is that it is using default notification type "new post"
It would be better to use "new post" only when there really is a new
post and "edited" when categories or tags were modified.
Previously if local login via email was disabled because of the site setting or because SSO was enabled, we were raising a 500 error. We now raise a 403 error instead; we shouldn't raise 500 errors on purpose, instead keeping that code for unhandled errors. It doesn't make sense in the context of what we are validating either to raise a 500.
This fix allows a user to remove their currently assigned primary group
if the Site Setting `user selected primary groups` is enabled.
Before this fix, if a user selected "none" for their primary group it
would silently fail and never be updated.
The timezone should only be initialized when there is no timezone stored in the DB yet. This also fixes an error that happened in dev mode whenever you switch between user preference tabs.
ReviewableScore#types extend the PostActionTypes with their own, storing the result inside a class variable. To avoid overwriting an existing flag, we need to calculate the next flag ID using these types instead of the PostAction ones. Since we first call the score types to calculate the id, this list gets memoized, leaving us with an outdated list.
To fix this, we now reload ReviewableScore#types after replacing flags.
* When we refactored away the admin-login route we introduced a bug where admins could not log into an SSO enabled site, because of a check in the email_login route that disallowed this.
* Allow admin to get around this check.
* DEV: Fix the function prototype observers deprecation
DEPRECATION: Function prototype extensions have been deprecated, please migrate from function(){}.observes('foo') to observer('foo', function() {}). [deprecation id: function-prototype-extensions.observes] See https://deprecations.emberjs.com/v3.x/#toc_function-prototype-extensions-observes for more details.
* DEV: Fix the function prototype event listeners deprecation
DEPRECATION: Function prototype extensions have been deprecated, please migrate from function(){}.on('foo') to on('foo', function() {}). [deprecation id: function-prototype-extensions.on] See https://deprecations.emberjs.com/v3.x/#toc_function-prototype-extensions-on for more details.
* DEV: Simplify `default as` imports
Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>
This breaking change was originally a deprecation fix for overriding a computed property `none`.
There are 4 uses of `rootNone` in core and "all-the-plugins":
1. in discourse-chat-integration, admin-plugins-chat-edit-rule.hbs - changed behavior, that I'd consider a fix - `rootNoneLabel` is now used regardless of `siteSettings.allow_uncategorized_topics` value, which I believe was an originally intended behavior (i.e. it most likely hasn't been tested with disabled uncategorized topics)
2. in discourse-slack-official, plugins-slack.hbs - the same as 1.
3. in core, edit-category-general.hbs (in this PR) - no change in behavior
4. in discourse-googlebooks, edit-category-general.hbs - no change in behavior (since `allowUncategorized="true"` is also passed as an argument)
* when we dragged the topic-timeline handle past the last post
in a topic we were not closing the timeline as we would if
scrolling to a specific post
* this also fixes the issue where when scrolling past the end of
the topic with a massive last post, none of the post could be
seen
### General Changes and Duplication
* We now consider a post `with_secure_media?` if it is in a read-restricted category.
* When uploading we now set an upload's secure status straight away.
* When uploading if `SiteSetting.secure_media` is enabled, we do not check to see if the upload already exists using the `sha1` digest of the upload. The `sha1` column of the upload is filled with a `SecureRandom.hex(20)` value which is the same length as `Upload::SHA1_LENGTH`. The `original_sha1` column is filled with the _real_ sha1 digest of the file.
* Whether an upload `should_be_secure?` is now determined by whether the `access_control_post` is `with_secure_media?` (if there is no access control post then we leave the secure status as is).
* When serializing the upload, we now cook the URL if the upload is secure. This is so it shows up correctly in the composer preview, because we set secure status on upload.
### Viewing Secure Media
* The secure-media-upload URL will take the post that the upload is attached to into account via `Guardian.can_see?` for access permissions
* If there is no `access_control_post` then we just deliver the media. This should be a rare occurrance and shouldn't cause issues as the `access_control_post` is set when `link_post_uploads` is called via `CookedPostProcessor`
### Removed
We no longer do any of these because we do not reuse uploads by sha1 if secure media is enabled.
* We no longer have a way to prevent cross-posting of a secure upload from a private context to a public context.
* We no longer have to set `secure: false` for uploads when uploading for a theme component.
FIX: raised a proper NotFound exception when filtering groups by username with invalid username.
FIX: properly filter the groups based on current user visibility when viewing another user's groups.
DEV: Guardian.can_see_group?(group) is now using Guardian.can_see_groups(groups) instead of duplicating the same code.
FIX: spec for groups_controller#index when group directory is disabled for logged in user.
FIX: groups_controller.sortable specs to actually test all sorting combinations.
DEV: s/response_body/body/g for slightly shorter spec code.
FIX: rewrote the "view another user's groups" specs to test all group_visibility and members_group_visibility combinations.
DEV: Various refactoring for cleaner and more consistent code.
* UI: Mass grant a badge from the admin ui
* Send the uploaded CSV and badge ID to the backend
* Read the CSV and grant badge in batches
* UX: Communicate the result to the user
* Don't award if badge is disabled
* Create a 'send_notification' method to remove duplicated code, slightly shrink badge image. Replace router transition with href.
* Dynamically discover current route
Now that the spec is finished use the unprefixed API, which was also moved
from window to navigator.
Still uses feature detection so it fail gracefully when not available in
the user agent.
The previous concurrency-safe implementation relied on catching an
index conflict and following through appropriately. Unfortunately
those conflicts were logged to Postgres and there is no easy way
to turn them off.
This solution approaches the problem differently. It should still
be safe under concurrency and not log errors.
When using the login confirmation screen, the referrer URL is `/auth/{provider}`. That means that the user is redirected back to the confirmation screen after logging in, even though login was successful. This is very confusing. Instead, they should be redirected to the homepage.
This can be used for themes/plugins to specify additional URL parameters to be used when starting authentication. Example usage:
```
LoginMethod.findAll()[0].doLogin({params: {mydata: "myvalue"}});
```
Using the rails `form_tag` helper generates a form with the action attribute set to the current URL (without parameters). In this case, we want to include any GET parameters, so it is better to exclude the action attribute from the form tag, and allow browsers to submit to the current URL.
* Make scrolling to bottom post in topic more consistent
* when using the slider to scroll past the bottom post,
we now scroll to the bottom of the post/page IF the
post height is > the window height (e.g. really long
posts). if the post height is smaller, then we lock
onto and jump to the top of the post
* this also removes the mobile hack that would always jump
to the top of the last post on mobile
* Prettier lint
* Reapply "Rename 'target usernames' with 'target recipients' in Composer"
This reverts commit 9fe11d0fc3 which
reverted ebb288dc2c.
* DEV: Add test for replying to PM
I was playing with groups locally and saw this line. I suspect this method isn't needed at all because I don't see any reference to it anywhere in the code, and as far as I know ActiveRecord objects don't have an `id!` method so if this method is called dynamically somewhere it's most likely failing.
if SiteSetting.secure_media is disabled we still want to
redirect to the signed url for uploads that are marked as
secure because their ACLs are probably still private
* Add a rake task to disable secure media. This sets all uploads to `secure: false`, changes the upload ACL to public, and rebakes all the posts using the uploads to make sure they point to the correct URLs. This is in a transaction for each upload with the upload being updated the last step, so if the task fails it can be resumed.
* Also allow viewing media via the secure url if secure media is disabled, redirecting to the normal CDN url, because otherwise media links will be broken while we go and rebake all the posts + update ACLs
* DEV: Remove buffered rendering from topic-list-item
This is another refactoring in the multi-step process to remove all uses
of our custom Render Buffer.
Previous commit: 1c7305c0f1 in this
series.
This is just a refactor and should not change any functionality.
* apply prettier fix
* update syntax
* Use computed properties where possible
* switch to using didReceiveAttrs
* Simplify topic.pinned observer
43ddf60cdf introduced a new method for dismissing new topics in topic-tracking-state, which works on a per-category basis.
This commit removes the old mechanism, which was to delete all 'new' topics from the local tracking state, regardless of category.
6e1fe22 introduced the possiblity for category_users to have a NULL notification_level, so that we can store `last_seen_at` dates without locking the notification level. At the time, this did not affect the topic-tracking-state query. However, the query changes in f434de2 introduced a slight change in behavior.
Previously, a subquery would look for a category_user with notification_level=mute. f434de2 refactored this to remove the subquery, and inverted some of the logic to suit.
The new query checked for `notification_level <> :muted`. If `notification_level` is NULL, this comparison will return NULL. In this scenario, notification_level=NULL means that we should fall back to the default tracking level (regular), and so we want the expression to resolve as true, not false. There was already a check for the existence of the category_users row, but it did not check for the existence of a NOT NULL notification_level.
This commit amends the expression so that the notification_level will only be compared if it is non-null.
Providing invalid dates as the end_date or start_date param causes a 500 error and creates noise in the logs. This will handle the error and returns a proper 400 response to the client with a message that explains what the problem is.
Page used to jitter when oneboxes loaded images lazily.
Previously we inserted the the "shadow" loading image before the "real" image.
This meant that certain styling with `firstChild` CSS selectors would apply
incorrectly to the shadow image.
Additionally we had special case code for onebox and quoted images that was
not really needed due to this fix.
We had an old fix that used computed style for image height and width in
specific scenarios, we now run it all the time.
On slow devices there was a possibility that the cache fetch after amending
src at the end of the process would cause a flash, this is avoided using a
new onload handler.
This is required for people using apps with custom protocols. We still verify the entire URL (including protocol) against the site setting value.
Refactored wildcard_url_checker so that it always returns a boolean, rather than sometimes returning a regex match.
Under rare conditions due to bad HTTP timing and so on a draft could be
set at the exact same time from 2 unicorn workers.
When this happened and all the stars aligned, one of the sets would win
and the other would raise an error.
This transparently handles the situation without adding any cost to the
draft system.
The alternative is to add a distributed mutex, tricky DB transaction or handle
the error in the controller. However this seems like a reasonable way to
work around a pretty big edge case.
Plugins like https://github.com/discourse/discourse-calendar add extra HTML (e.g. icons) to user/group mentions. Clicking on those extra elements used to only flash a blank card. Now, the card opens properly.
- Refactor source_url to avoid using eval in development
- Precompile handlebars in development
- Include template compilers when running qunit
- Remove unsafe-eval in development CSP
- Include unsafe-eval only for qunit routes in development
Previously, categories without any topics were being excluded from the UPDATE query. This means the counter gets stuck, and the category cannot be deleted. This change ensures that the counters get correctly set to zero.
`highlight` was called from `didInsertElement` which technically doesn't ensure the list is rendered. By wrapping the highlighting code in `afterRender` we ensure it works more consistently.
Our current topic admin menu is not always fully visible on a mobile
device, therefore some options are difficult to click.
To solve this issue, we can display the admin menu on the bottom of the
screen on mobile devices.
- Ensure that the 'notify_moderators' flag is always the last flag when using custom flags.
- Support passign a custom FlagSettings object when replacing flags to reuse existing ones.
* FEATURE: allows plugins to add a global notice
Usage:
```
api.addGlobalNotice(id, text, options = {});
```
Options can be:
```
dismissable // Will display a button to hide the notice if true
html // will prepend html to the next if present
level // alert level, will usee css class of alert component
persistentDismiss // if true won't show notice again on reload
onDismiss // execute a custom action on dismiss
visibility // defines custom logic for notice visibility
```
Co-authored-by: Robin Ward <robin.ward@gmail.com>
Changelog is available here - https://github.com/necolas/normalize.css/blob/master/CHANGELOG.md
I decided that the easiest way to ensure it works would be checking different browsers. It looked good to me on Chrome, Firefox, Edge and IE 11. In addition, I checked 3 random themes.
The bug mentioned here
https://meta.discourse.org/t/badge-not-triggering/135896/8
Basically, descriptions for 3 badges: "Out of Love", "Higher Love" and
"Crazy in Love" are granted based on on "max_likes_per_day" and the
description should reflect that.
* FIX: category routes model params should decode their URL parts
Ember's route star globbing does not uri decode by default. This is
problematic for subcategory globs with encoded URL site settings enabled.
Subcategories with encoded URLs will 404 without this decode.
I found this https://github.com/tildeio/route-recognizer/pull/91
which explicitly explains that globbing does not decode automatically.
This was re-encoding the search slug each loop - if the category list was not
the first category in the list, it'd continually search with a re-encoded search
term from the previous iteration. This results in ember 404ing when navigating
to raw encoded category slugs of the form /c/encoded-slug-with-non-ascii
that have no ID attached.
Restore tl3 reachability by calculating penalty counts vs unsuspend/unsilence.
Only count unsuspend or unsilences that have been made by a user other than
the Discourse system user.
This commit fe9293b8b5 created a regression.
The problem is that dom changed a little bit.
Before it was
```
<tr class="instructions create-account-email">
<td></td>
<div id="account-email-validation" class="tip bad ember-view"></div>
<td><label>Never shown to the public.</label></td>
</tr>
```
And after we got
```
<tr class="instructions create-account-email">
<td></td>
<div id="account-email-validation" class="tip bad ember-view"> </div>
<td><label>Never shown to the public.</label></td>
</tr>
```
That small space may look like not important change.
However, now helpers are hitting that CSS rule:
```
.login-form {
.tip {
&:not(:empty) + td {
display: none;
}
}
```
To fix it, we should render template only if there is a reason - like it was before
```
if (reason) {
buffer.push(iconHTML(this.good ? "check" : "times") + " " + reason);
}
```
* FIX: remove rerenderTriggers
A small fix for Basic User Serializers where some downstream serializers do not correctly set user objects. This caused some issues in certain plugins that depend on the user method to return a user.
- Using h4 instead of h3 for sub-categories.
- Show category description if it does not have subcategories.
- Implemented equivalent for mobile-view.
- Include description_excerpt in basic serializer. This is needed for
displaying second-level categories in category list.
Follow-up to 9253cb79e3.
The maximum level used to be one, which meant that a category could be
either a parent or a child. If it was a parent, the subcategories were
shown; if it was a child then the parent selector was shown.
With multiple levels of nesting, a category can be both a parent and a
child.
There is a problem that if you read all messages, even when a new one
arrives, the button on the top is not showing.
This is because once the button got `hidden` class, a label under is
properly updated, however, the class is not removed.
Therefore, I added computed isHidden function which is recalculated when
`count` change.
