* Refactor shouldUpdateScroll passing

So far, shouldUpdateScroll has been manually passed down from the very top of
the React component hierarchy even though it is a static function common to
all ScrollContainer instances, so replaced that with a custom class extending
ScrollContainer.

* Generalize “press back to close modal” to any modal and to public pages

* Fix boost confirmation modal closing media modal

Fixes #15133

* Various dropdown code quality fixes

* Prepare support for privacy selection in boost modal

* Add dropdown for boost privacy in boost confirmation modal

* Change notification permission handling

- allow changing individual alert settings even if permission is not explicitly
  enabled (asks for permission on toggle)
- persist permission request banner dismissal across sessions through settings

* Add additional, more discrete message to grant permissions

* Change permission granting button design according to reviews

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

Add missing controls for new notification type

* Add notification permission handling code

* Request notification permission when enabling any notification setting

* Add badge to notification settings when permissions insufficient

* Disable alerts by default, requesting permission and enable them on onboarding

* Fix mark as read in notifications to be saved immediately

* fix code style

* Add unread notification markers

Fixes #14804

* Allow IntersectionObserverArticle's children to be updated

* Add bell button

Fix #4890

* Remove duplicate type from post-deployment migration

* Fix legacy class type mappings

* Improve query performance with better index

* Fix validation

* Remove redundant index from notifications

* Add follow_request notification type

The notification type already existed in the backend but was never pushed
to the front-end. This also means translation strings were also available
for the backend, from the notification mailer.

Unlike other notification types, these are off by default, to match what
I remember of Gargron's view on the topic: that follow requests should not
clutter notifications and should instead be reviewed at the user's own
leisure in the dedicated column.

Since follow requests have their own column, I've deemed it unnecessary to
add a specific tab for them in the notification quick filter.

* Show follow request link in single-column if there are pending requests, even if account isn't locked

* Push follow requests from notifications to the follow_requests list

* Offer to accept or reject follow request from the notification

* Redesign follow request notification

run `yarn manage:translations en`

* Fix weird scroll-jumping behavior with pending items

* Treat pending items as unread items

* Fix scroll position being altered because of the “X new items” button

Fix #10840

Fix #9031
Fix #7913

* Add UI for enabling/disabling poll notifications

* Add poll notifications to the (advanced) quick filter bar

* Update poll notification message

“Your poll has ended” → “A poll you have voted in has ended”

* Clear up associated notifications when a poll is deleted

* Process incoming poll tallies update

* Send Update on poll vote

* Do not send Updates for a poll more often than once every 3 minutes

* Include voters in people to notify of results update

* Schedule closing poll worker on poll creation

* Add new notification type for ending polls

* Add front-end support for ended poll notifications

* Fix UpdatePollSerializer

* Fix Updates not being triggered by local votes

* Fix tests failure

* Fix web push notifications for closing polls

* Minor cleanup

* Notify voters of both remote and local polls when those close

* Fix delivery of poll updates to mentioned accounts and voters

* Avoid two-step rendering of statuses as much as possible

Cache width shared by Video player, MediaGallery and Cards at the
ScrollableList level, pass it down through StatusList and Notifications.

* Adjust scroll when new preview cards appear

* Adjust scroll when statuses above the current scroll position are deleted

* Refactor uses of icons to an Icon component in web UI

* Refactor options passed to the Icon component

* Make tests work with absolute component paths

Revert #9423. Issues with line breaks / clutter.

* create FilterBar componer and its container, unstyled

* introduce basic styling for FilterBar

* add selection css

* allow FilterBar to display active CSS with js

* connect the FilterBar to the Redux state

* change getNotifications to use filter

* remove temporary comments

* add an option to turn the FilterBar off in settings

* fix showFilterBar data type to boolean

* fix eslint errors

* add English and Polish translations

* allowed filter bar overflow to accomodate for longer languages

* fix mispelled translation key

* add unified CSS look

* replace text in FilterBar with icons

* add tooltips

* replace text @ with an icon

* introduce simple and advanced filtering view

* add ability to toggle the advanced view

* add Polish translations

* change Advanced View description to be more clear

* make each filter flush notifications and load new ones, fixing pagination

* simplify getNotifications once frontend filtering is not needed for FilterBar

* add a semicolon

* Revert "simplify getNotifications once frontend filtering is not needed for FilterBar"

This reverts commit 9f4be78571.

* reset filter to 'all' when turning off FilterBar

* add RelativeTimestamp elements

* style the elements properly with CSS

* Use global loading indicator when loading more items

* Use local loading indicator for notifications

And remove global loading indicator for initial custom emojis load

* Revert "Fix some icon names changed by the Font Awesome 5. (#8796)"

This reverts commit 3f9ec3de82.

* Revert "Migrate to font-awesome 5.0. (#8799)"

This reverts commit 8bae14591b.

* Revert "Fix some icons names, unavailable in fontawesome5 (free license). (#8792)"

This reverts commit b9c727a945.

* Revert "Update the icon name changed by the Font Awesome 5. (#8776)"

This reverts commit 17af4d27da.

* Revert "Add bot icon to bot avatars and migrate to newer version of Font Awesome (#8484)"

This reverts commit 4b794e134d.

Fixes #8755

Fix #8192

Fix #4485

* Hook up filtering to statuses in notifications column

* Filter notifications for sound, desktop notifications

onScrollToBottom was a function to run instead of onScrollToTop and
onScroll when scrolling to the bottom. The behavior to prevent
onScrollToTop was inconvenient because the viewport can be at the bottom
and at the top at the same time if the viewport is larger than the
container.

onScrollToBottom was also called when the button to load more is clicked
on contray to the name suggests, which led notifications and
status_list_container components to mark the scrolled location is not at
the top mistakenly.

onLoadMore is a replacement for onScrollToBottom. It will be called
independently from onScrollToTop and onScroll.

The top of the scrollable notifications will be invisible after unmounting.
The Redux state should be updated accordingly in such a case so that the
unread notification counter will be updated later.

* Fix #1095 - Surround mid-text display names with bdi tags

* Update jest snapshot

* Remove onSave method in mapped properties for column_settings

* Make web_push_subscription.register an action