Experiment moving from preload tags in the document head to preload information the the response headers.
While this is a minor improvement in most browsers (headers are parsed before the response body), this allows smart proxies like Cloudflare to "learn" from those headers and build HTTP 103 Early Hints for subsequent requests to the same URI, which will allow the user agent to download and parse our JS/CSS while we are waiting for the server to generate and stream the HTML response.
Co-authored-by: Penar Musaraj <pmusaraj@gmail.com>
I convert these Composer (and Topic) functions one by one because stuff do be breaking 😄
Moved the special pretender handler code from the global one to the tests that actually require it.
Adds a new upload field for a second dark mode category logo.
This alternative will be used when the browser is in dark mode (similar to the global site setting for a dark logo).
This IMAGES_EXTENSIONS_REGEX const just creates redundancy
when we already have the `isImage` function -- the two can
easily get out of sync. Replace all usages of the former
with the latter.
These errors tend to indicate that the upload is missing on the remote store. This is bad, but we don't want it to block the dominant-color calculation process. This commit catches errors when there is an HTTP error, and fixes the `base_store.rb` implementation when `FileHelper.download` returns nil.
Prior to this fix pressing tab multiple times in the sidebar, you would end up focusing invisible "sidebar-section-header-button". This change ensures the button will become visible when tabbing even if not hovering this section.
The `background: transparent change` is to avoid a flashing background due to different transition timing on the collapsable button.
Previously, when categories were not muted by default, we were sending message about unmuted topics (topics which user explicitly set notification level to watching)
The same mechanism can be used to fix a bug. When the user was explicitly watching topic, but category was muted, then the user was not informed about new reply.
The feedback we got here is that the contextual topic list link
behaviour is surprising and people prefer that the topic list sidebar
links always go to a consistent location.
Internal ref: /t/74666/16
This PR enables the [`no-action-modifiers`](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-action-modifiers.md) template lint rule and removes all usages of the `{{action}}` modifier in core.
In general, instances of `{{action "x"}}` have been replaced with `{{on "click" (action "x")}}`.
In many cases, such as for `a` elements, we also need to prevent default event handling to avoid unwanted side effects. While the `{{action}}` modifier internally calls `event.preventDefault()`, we need to handle these cases more explicitly. For this purpose, this PR also adds the [ember-event-helpers](https://github.com/buschtoens/ember-event-helpers) dependency so we can use the `prevent-default` handler. For instance:
```
<a href {{on "click" (prevent-default (action "x"))}}>Do X</a>
```
Note that `action` has not in general been refactored away as a helper yet. In general, all event handlers should be methods on the corresponding component and referenced directly (e.g. `{{on "click" this.doSomething}}`). However, the `action` helper is used extensively throughout the codebase and often references methods in the `actions` hash on controllers or routes. Thus this refactor will also be extensive and probably deserves a separate PR.
Note: This work was done to complement #17767 by minimizing the potential impact of the `action` modifier override, which uses private API and arguably should be replaced with an AST transform.
This is a followup to #18333, which had to be reverted because it did not account for the default treatment of modifier keys by the {{action}} modifier.
Commits:
* Enable `no-action-modifiers` template lint rule
* Replace {{action "x"}} with {{on "click" (action "x")}}
* Remove unnecessary action helper usage
* Remove ctl+click tests for user-menu
These tests now break in Chrome when used with addEventListener. As per the comment, they can probably be safely removed.
* Prevent default event handlers to avoid unwanted side effects
Uses `event.preventDefault()` in event handlers to prevent default event handling. This had been done automatically by the `action` modifier, but is not always desirable or necessary.
* Restore UserCardContents#showUser action to avoid regression
By keeping the `showUser` action, we can avoid a breaking change for plugins that rely upon it, while not interfering with the `showUser` argument that's been passed.
* Revert EditCategoryTab#selectTab -> EditCategoryTab#select
Avoid potential breaking change in themes / plugins
* Restore GroupCardContents#showGroup action to avoid regression
By keeping the `showGroup` action, we can avoid a breaking change for plugins that rely upon it, while not interfering with the `showGroup` argument that's been passed.
* Restore SecondFactorAddTotp#showSecondFactorKey action to avoid regression
By keeping the `showSecondFactorKey` action, we can avoid a breaking change for plugins that rely upon it, while not interfering with the `showSecondFactorKey` property that's maintained on the controller.
* Refactor away from `actions` hash in ChooseMessage component
* Modernize EmojiPicker#onCategorySelection usage
* Modernize SearchResultEntry#logClick usage
* Modernize Discovery::Categories#showInserted usage
* Modernize Preferences::Account#resendConfirmationEmail usage
* Modernize MultiSelect::SelectedCategory#onSelectedNameClick usage
* Favor fn over action in SelectedChoice component
* Modernize WizardStep event handlers
* Favor fn over action usage in buttons
* Restore Login#forgotPassword action to avoid possible regression
* Introduce modKeysPressed utility
Returns an array of modifier keys that are pressed during a given `MouseEvent` or `KeyboardEvent`.
* Don't interfere with click events on links with `href` values when modifier keys are pressed
This commit makes pending reviewables show up in the main tab (a.k.a. "all notifications" tab). Pending reviewables along with unread notifications are always shown first and they're sorted based on their creation date (most recent comes first).
The dismiss button currently only shows up if there are unread notifications and it doesn't dismiss pending reviewables. We may follow up with another change soon that allows makes the dismiss button work with reviewables and remove them from the list without taking any action on them.
Follow-up to 079450c9e4.
No tests cause a missing icon regression is not the end of the world and
I don't feel like it will provide enough value as a regression test long
term.
This PR renames the old Sidebar::Section displaySection function
to displaySectionContent, and changes the meaning of displaySection
to hide the entire sidebar section including the header. This is
implemented via an arg passed to Sidebar::Section, which will default
to true if it is not passed, and the BaseCustomSidebarSection class
implements a default of `return true` for this function.
`discovery.category` route respects the default view of the category as
configured by `Category#default_view`. `discovery.latestCategory` forces
the latest filter when viewing the category which is not what we want.
https://meta.discourse.org/t/239999
Skipped invites were not counted at all and some invites could generate
more than one error and resulted in a grand total that was not equal to
the count of bulk invites.
This PR enables the [`no-action-modifiers`](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-action-modifiers.md) template lint rule and removes all usages of the `{{action}}` modifier in core.
In general, instances of `{{action "x"}}` have been replaced with `{{on "click" (action "x")}}`.
In many cases, such as for `a` elements, we also need to prevent default event handling to avoid unwanted side effects. While the `{{action}}` modifier internally calls `event.preventDefault()`, we need to handle these cases more explicitly. For this purpose, this PR also adds the [ember-event-helpers](https://github.com/buschtoens/ember-event-helpers) dependency so we can use the `prevent-default` handler. For instance:
```
<a href {{on "click" (prevent-default (action "x"))}}>Do X</a>
```
Note that `action` has not in general been refactored away as a helper yet. In general, all event handlers should be methods on the corresponding component and referenced directly (e.g. `{{on "click" this.doSomething}}`). However, the `action` helper is used extensively throughout the codebase and often references methods in the `actions` hash on controllers or routes. Thus this refactor will also be extensive and probably deserves a separate PR.
Note: This work was done to complement #17767 by minimizing the potential impact of the `action` modifier override, which uses private API and arguably should be replaced with an AST transform.
Commits:
* Enable `no-action-modifiers` template lint rule
* Replace {{action "x"}} with {{on "click" (action "x")}}
* Remove unnecessary action helper usage
* Remove ctl+click tests for user-menu
These tests now break in Chrome when used with addEventListener. As per the comment, they can probably be safely removed.
* Prevent default event handlers to avoid unwanted side effects
Uses `event.preventDefault()` in event handlers to prevent default event handling. This had been done automatically by the `action` modifier, but is not always desirable or necessary.
* Restore UserCardContents#showUser action to avoid regression
By keeping the `showUser` action, we can avoid a breaking change for plugins that rely upon it, while not interfering with the `showUser` argument that's been passed.
* Revert EditCategoryTab#selectTab -> EditCategoryTab#select
Avoid potential breaking change in themes / plugins
* Restore GroupCardContents#showGroup action to avoid regression
By keeping the `showGroup` action, we can avoid a breaking change for plugins that rely upon it, while not interfering with the `showGroup` argument that's been passed.
* Restore SecondFactorAddTotp#showSecondFactorKey action to avoid regression
By keeping the `showSecondFactorKey` action, we can avoid a breaking change for plugins that rely upon it, while not interfering with the `showSecondFactorKey` property that's maintained on the controller.
* Refactor away from `actions` hash in ChooseMessage component
* Modernize EmojiPicker#onCategorySelection usage
* Modernize SearchResultEntry#logClick usage
* Modernize Discovery::Categories#showInserted usage
* Modernize Preferences::Account#resendConfirmationEmail usage
* Modernize MultiSelect::SelectedCategory#onSelectedNameClick usage
* Favor fn over action in SelectedChoice component
* Modernize WizardStep event handlers
* Favor fn over action usage in buttons
* Restore Login#forgotPassword action to avoid possible regression
* FIX: New general category changes preventing topic create
Follow up to: #18383
The logic in the previous commit was checking for null, but we are
seeding the SiteSetting.general_category_id with an id of -1 so we need
to check for a positive value as well as checking for null.
See: https://meta.discourse.org/t/240661
* Add js test for presence of category… dropdown option
* FEATURE: Make General the default category
* Set general as the default category in the composer model instead
* use semicolon
* Enable allow_uncategorized_topics in create_post spec helper for now
* Check if general_category_id is set
* Enable allow_uncategorized_topics for test env
* Provide an option to the create_post helper to not set allow_uncategorized_topics
* Add tests to check that category… is not present and that General is selected automatically
When a user enters a topic they have already visited they are navigated
to that post that is newest for them (post_number_last_read + 1). Above
that post there is a "last visited" line marker which is visible when
the user scrolls a bit above the post they landed on. This commit makes
sure that the "last visited" line marker is visible as soon as user is
landed in the topic.
A zero-width space character is inserted for icon-only buttons, but that
is unnecessary when the button has some rich-content and the block form
is used.
This commit adds non-archived group messages and `group_message_summary` notifications in the messages tab in the user menu. With this change, the messages tab in the user menu now includes 3 types of items:
1. Unread `private_message` notifications (notifications when you receive a reply in a PM)
2. Unread and read `group_message_summary` notifications (notifications when there's a new message in a group inbox that you track)
3. Non-archived personal and group messages
Unread `private_message` notifications are always shown first, followed by unread `group_message_summary` notifications, and then everything else (messages and read `group_message_summary` notifications) sorted by recency (most recent first).
Internal topic: t/72976.
In a recent commit when adding the review section link, I moved to a
pattern where we allowed the section links to be refreshed after the
section has been constructed. However, we were not tearing down the old
section links when refreshing. This made me realise that refreshing
section links in a section is not a pattern I want to adopt since people
can easily forget to teardown. Instead, each section link should be
responsible for defining a teardown function for cleanup which will
always be called when the sidebar is removed.
Currently, the reviewables tab in the user menu shows pending reviewables at the top of the menu and fills the remaining space in the menu with old/handled reviewables. This PR makes the revieables tab show only pending reviewables and hides the tab altogether from the menu if there are no pending reviewables. We're going to follow-up with another change soon that will show pending reviewables in the main tab of the user menu.
Internal topic: t/73220.
This commit addresses issues around starting new uploads in a composer etc.
when one or more uploads are already processing or uploading.
There were a couple of issues:
1. When all preprocessors were complete, we were not resetting
`completeProcessing` to 0, which meant that `needProcessing`
would never match `completeProcessing` if a new upload was
started.
2. We were relying on the uppy "complete" event which is supposed
to fire when all uploads are complete, but this doesn't seem to take
into account new uploads that are added. Instead now we can rely on
our own `inProgressUploads` tracker, and consider all uploads complete
when there are no `inProgressUploads` in flight
* SECURITY: moderator shouldn't be able to import a theme via API.
* DEV: apply `AdminConstraint` for all the "themes" routes.
Co-authored-by: Vinoth Kannan <svkn.87@gmail.com>
* REFACTOR: Improve reusability by Decoupling flag modal from flag target.
We want chat message's flags to have the same features as topic and posts' flags, but we prefer not having to duplicate core's logic. This PR moves target specific bits to different classes, allowing plugins to flag custom things by
providing their own.
* A couple of fixes for the flag modal:
- Make sure buttons are disabled until a flag type is selected.
- Don't throw an error when checking if the user can undo an action on a deleted topic.
- Disable flagging on deleted topics.
Previously we used `Category#category_excerpt` but the excerpt keeps the
HTML entities around if present and we can't really display HTML in the
title of a link.
This commit introduces an icon to all links in the sidebar. If an icon has not been configured, we will fall back to a generic "link" icon. As part of this commit, we also standardised the size of each prefix to 20px by 20px and set a fix margin. This is to allow sufficient space for text prefixes and image prefixes to be displayed.
Tests have been intentionally left out for now as I don't feel like asserting for the icons will bring much value at this point. Time shall prove me wrong.
Co-authored-by: awesomerobot <kris.aubuchon@discourse.org>
This commit renames all secure_media related settings to secure_uploads_* along with the associated functionality.
This is being done because "media" does not really cover it, we aren't just doing this for images and videos etc. but for all uploads in the site.
Additionally, in future we want to secure more types of uploads, and enable a kind of "mixed mode" where some uploads are secure and some are not, so keeping media in the name is just confusing.
This also keeps compatibility with the `secure-media-uploads` path, and changes new
secure URLs to be `secure-uploads`.
Deprecated settings:
* secure_media -> secure_uploads
* secure_media_allow_embed_images_in_emails -> secure_uploads_allow_embed_images_in_emails
* secure_media_max_email_embed_image_size_kb -> secure_uploads_max_email_embed_image_size_kb
The rationale behind this change is that quote notifications are almost always as important as replies notifications so it makes sense for them to be included in the replies tab instead of the "other" tab. Internal topic: t/74748.
This PR makes adjusted composer height persistent for a user. After dragging to change the composer height, the updated height will be stored in localStorage and will be restored when opening the composer again.
We subscribe to a couple of MessageBus channels when the review-index route is entered, but we should unsubscribe when exiting the route otherwise callbacks would leak every time the review-index is entered and that might cause subtle and weird bugs or errors.
When there are pending reviewables, the review section link is displayed
in the main section. When there are no pending reviewables, the review
section link is displayed under the more links drawer.
Internal ref: /t/74210
* FEATURE: add composer warning when user haven't been seen in a long time
When a user creates a PM and adds a recipient that hasn't been seen in a
long time then we'll now show a warning in composer indicating that the
user hasn't been seen in a long time.
- in group activity, allows avatars to be selectable by tabbing or screen readers
- in user activity > drafts, fixes a bug where for draft replies, the wrong avatar was being shown in the user card
- in both group and user activity, fixes the order of focusable items
In the past, CategoryFeaturedTopic.feature_topics raised an exception
sometimes because it tried to create multiple CategoryFeaturedTopic
records for the same topic.
This code should not raise any exceptions as long as the list of new
topic IDs is unique because all previous records are deleted first,
then recreated and everything happens inside a transaction. The previous
rescue block was dead code anyway because it tried to catch
PG::UniqueViolation instead of ActiveRecord::RecordNotUnique. This
commit includes a fix to ensure that the topic IDs are unique.
By default, we won't include associated account ids in current user serializer. If the new hidden site setting `include_associated_account_ids` is enabled then we will add it in the serializer.
* FIX: Better virtual keyboard detect on Android
Firefox has a bug where *sometimes* the visualViewport.height won't be
updated when the keyboard pops up until you scroll, making our composer
stay hidden behind the keyboard. This commit uses both window.innerHeight
and window.visualViewport.height using the minimum of both to check for
height changes.
For Chrome/Edge we feature detect the new VirtualKeyboard API and
opt-into it when the composer opens and use it to detect if a keyboard
is being draw. Opting into the API changes how the viewport is
calculated so we have to also change how the full height composer is
calculated. To minimize breakage we opt-out when the composer component
is destroyed.
This commit also moves the `--composer-ipad-padding` to only happen on
iPads.
Bug report at https://meta.discourse.org/t/-/228382
Although showPopover continues to toggle the popover (showing if hidden / hiding if shown), hidePopover now will only hide the popover. Furthermore, isPopoverShown has been introduced to provide insight into whether the popover is currently shown or not, and therefore whether it should be hidden or shown.
Also, the showPopover / hidePopover test has been refined to override `trigger` and `hideOnClick` settings to allow for full imperative control of showing / hiding the popover.
This will replace `enable_personal_messages` and
`min_trust_to_send_messages`, this commit introduces
the setting `personal_message_enabled_groups`
and uses it in all places that `enable_personal_messages`
and `min_trust_to_send_messages` currently apply.
A migration is included to set `personal_message_enabled_groups`
based on the following rules:
* If `enable_personal_messages` was false, then set
`personal_message_enabled_groups` to `3`, which is
the staff auto group
* If `min_trust_to_send_messages` is not default (1)
and the above condition is false, then set the
`personal_message_enabled_groups` setting to
the appropriate auto group based on the trust level
* Otherwise just set `personal_message_enabled_groups` to
11 which is the TL1 auto group
After follow-up PRs to plugins using these old settings, we will be
able to drop the old settings from core, in the meantime I've added
DEPRECATED notices to their descriptions and added them
to the deprecated site settings list.
This commit also introduces a `_map` shortcut method definition
for all `group_list` site settings, e.g. `SiteSetting.personal_message_enabled_groups`
also has `SiteSetting.personal_message_enabled_groups_map` available,
which automatically splits the setting by `|` and converts it into
an array of integers.
See https://meta.discourse.org/t/discourse-email-messages-are-incorrectly-threaded/233499
for thorough reasoning.
This commit changes how we generate Message-IDs and do email
threading for emails sent from Discourse. The main changes are
as follows:
* Introduce an outbound_message_id column on Post that
is either a) filled with a Discourse-generated Message-ID
the first time that post is used for an outbound email
or b) filled with an original Message-ID from an external
mail client or service if the post was created from an
incoming email.
* Change Discourse-generated Message-IDs to be more consistent
and static, in the format `discourse/post/:post_id@:host`
* Do not send References or In-Reply-To headers for emails sent
for the OP of topics.
* Make sure that In-Reply-To is filled with either a) the OP's
Message-ID if the post is not a direct reply or b) the parent
post's Message-ID
* Make sure that In-Reply-To has all referenced post's Message-IDs
* Make sure that References is filled with a chain of Message-IDs
from the OP down to the parent post of the new post.
We also are keeping X-Discourse-Post-Id and X-Discourse-Topic-Id,
headers that we previously removed, for easier visual debugging
of outbound emails.
Finally, we backfill the `outbound_message_id` for posts that have
a linked `IncomingEmail` record, using the `message_id` of that record.
We do not need to do that for posts that don't have an incoming email
since they are backfilled at runtime if `outbound_message_id` is missing.
When `allow_uncategorized_topics` is set to `false`, we do not want to
show the uncategorized in sidebar by default.
This commit updates a couple of places in the code related to sidebar
which was incorrectly using `suppress_uncategorized_badge` site setting
which is mainly used for hiding the category badge for uncategorized
category and should not be used to determine if uncategorized categories
should be allowed or not.
This PR makes some updates to the prior keyboard accessibility commit (eb98746):
- Makes `tabindex` attribute only appear on emoji markup in the emoji picker.
- After pressing the Esc key, focus returns to the <textarea/> input (composer editor or chat input)
* DEV: Add test case for syntax highlight of complex HTML
The commit 685e0da upgrade HighlightJS to version 11, which deprecates
syntax highlight of complex HTML elements. See https://github.com/highlightjs/highlight.js/issues/2889
This brought a regression of syntax highlighting of GitHub oneboxes,
which was fixed in 09cec7d. This commit adds a test case to prevent
future regressions like this one.
* fix test and warning
* DEV: Make emoji elements focusable
Since emoji elements are of type `<img>` it requires a `tablindex="0"` in order to be focusable.
* WIP: Handle emoji focus/selection via arrow keys
Near completion, however, need a few fixes/improvements and overall code cleanup
* WIP: Testing
* DEV: Fixes and cleanup
* DEV: Follow conventions
* DEV: Improve up/down traversal when recents present
* DEV: Emoji markup in tests should include `tabindex`
* DEV: Add `tabindex` to topic tests
* DEV: Variable name as `searchInput` instead of `searchBar`
* DEV: Use appropriate method name (`_setNumEmojiPerRow`)
* DEV: Add comments and avoid nested if
* WIP: Adding test
* Fix first test
* DEV: Add assertions for arrow keys and escape key
* Some fixes for up/down navigation
This does not fix everything, when going from one section to another,
there are issues
* Fix a small regression
* FIX: Ability to focus on search results
Fixes regression
* Refactor calculating next up/down emoji
* Debugging test failure
* Skip stubborn CI test, add others
Co-authored-by: Penar Musaraj <pmusaraj@gmail.com>
This isn't a security bug, because only admins can create user fields
and we have to trust admins, because they can change themes, which are
shown site-wide and can contain unrestricted JS.
Both versions are used with `--headless`, so labelling one "Firefox" and the other "Firefox Headless" doesn't really make sense. Evergreen / ESR are better descriptions.
Using the owner of `site` is not perfectly reliable, especially given that `site` is stubbed in tests. Instead, we can fetch the owner of the `context` object itself.
Also, Ember sets the owner of an EmberObject based on the first parameter to `create`. This is preferable to a separate `setOwner` call because it means the owner is available during initialization.
Unfortunately we don't have any way to compile raw templates inline during tests, so testing this behavior in core is very difficult. Given that we aim to remove the raw handlebars system in the not-too-distant future, it doesn't make sense to invest lots of time on tooling here. Regressions of this behavior will be detected by theme CI tests [like this](https://github.com/discourse/discourse-topic-thumbnails/pull/21).
The `add_column` `limit` parameter has no effect on a postgres `text` column. Instead we can perform the check in ActiveRecord.
We never expect this condition to be hit - users cannot control this value. It's just a safety net.
This commits introduces a new SiteSetting.enable_new_user_profile_nav_groups
feature flag. When configured, users of the configured groups will see
the new user page navigation links.
As of this commit, only the user activity navigation link has been
converted to the newly proposed dropdown of navigation links.
Mobile support has not been considered.
Previously we were calculating both the minimum and maximum widths for
SK dropdowns using this Popper modifier. The max. width calculation was
causing issues with dropdowns in Firefox and was also sluggish when
rendering.
This switches to using CSS calculations for max. widths. It adds a 600px
global maximum and targeted maximums for the category composer dropdown
and the bookmark list dropdowns.
Adds limits to location and website fields at model and DB level
to match the bio_raw field limits. A limit cannot be added at the
DB level for bio_raw because it is a postgres text field.
Co-authored-by: Alan Guo Xiang Tan <gxtan1990@gmail.com>
Highlight.js 11 deprecated the feature to highlight HTML blocks while
keeping the HTML structure, which broke our GitHub onebox syntax
highlight.
This patch adds it back by bringing the maintainers code as a plugin.
See https://github.com/highlightjs/highlight.js/issues/2889
This commit includes various accessibility improvements for the new user menu:
* Add `title` attributes to the user menu tabs
* Properly label lists (by adding `aria-labelledby` to `<ul>` elements) for screen readers
* Change the user menu structure so that the tabs come before the content panel in the DOM, but use CSS to reverse them visually.
Normally, changing the order of elements via CSS is bad for accessibility, but I believe this is one of the rare scenarios where it [makes sense](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Ordering_Flex_Items#use_cases_for_order). Prior to this change, if you want to reach the first notification item after you select a tab using the keyboard, you have to hit <kbd>ctrl</kbd>+<kbd>tab</kbd> because the notifications list is before the tabs list. However, with this change, <kbd>tab</kbd> will move you to the first item in the list after you select a tab using your keyboard.
* Aria-hide the unread notifications badge/count on the tabs because the `title` attribute on the tab indicates the unread count.
* Add some tests.
In itself, this change will not cause tests to run in parallel. It just unlocks the ability to use tools like `ember exam` to run tests in parallel. For example:
```
yarn ember exam --load-balance --parallel=3 --random
```
We previously had a system which would generate a 10x10px preview of images and add their URLs in a data-small-upload attribute. The client would then use that as the background-image of the `<img>` element. This works reasonably well on fast connections, but on slower connections it can take a few seconds for the placeholders to appear. The act of loading the placeholders can also break or delay the loading of the 'real' images.
This commit replaces the placeholder logic with a new approach. Instead of a 10x10px preview, we use imagemagick to calculate the average color of an image and store it in the database. The hex color value then added as a `data-dominant-color` attribute on the `<img>` element, and the client can use this as a `background-color` on the element while the real image is loading. That means no extra HTTP request is required, and so the placeholder color can appear instantly.
Dominant color will be calculated:
1. When a new upload is created
2. During a post rebake, if the dominant color is missing from an upload, it will be calculated and stored
3. Every 15 minutes, 25 old upload records are fetched and their dominant color calculated and stored. (part of the existing PeriodicalUpdates job)
Existing posts will continue to use the old 10x10px placeholder system until they are next rebaked
Upgrading to Markdown.it v13 broke empty inline BBCodes. This works around the problem by adding an empty token before a closing token if the previous token was a BBCode token.
It also removes the unused `jump` attribute which was removed in Markdown.it v12.3
