* Summary: fix slowness due to layout thrashing when reloading a large set of status updates
in order to limit the maximum size of a status in a list view (e.g. the home timeline), so as to avoid having to scroll all the way through an abnormally large status update (see https://github.com/tootsuite/mastodon/pull/8205), the following steps are taken:
•the element containing the status is rendered in the browser
•its height is calculated, to determine if it exceeds the maximum height threshold.
Unfortunately for performance, these steps are carried out in the componentDidMount(/Update) method, which also performs style modifications on the element. The combination of height request and style modification during javascript evaluation in the browser leads to layout-thrashing, where the elements are repeatedly re-laid-out (see https://developers.google.com/web/fundamentals/performance/rendering/avoid-large-complex-layouts-and-layout-thrashing & https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Performance_best_practices_for_Firefox_fe_engineers).
The solution implemented here is to memoize the collapsed state in Redux the first time the status is seen (e.g. when fetched as part of a small batch, to populate the home timeline) , so that on subsequent re-renders, the value can be queried, rather than recalculated. This strategy is derived from https://github.com/tootsuite/mastodon/pull/4439 & https://github.com/tootsuite/mastodon/pull/4909, and should resolve https://github.com/tootsuite/mastodon/issues/12455.
Andrew Lin (https://github.com/onethreeseven) is thanked for his assistance in root cause analysis and solution brainstorming
* remove getSnapshotBeforeUpdate from status
* remove componentWillUnmount from status
* persist last-intersected status update and restore when ScrollableList is restored
e.g. when navigating from home-timeline to a status conversational thread and <Back again
* cache currently-viewing status id to avoid calling redux with identical value
* refactor collapse toggle to pass explicit boolean
* Fix poll options not being selectable via keyboard
Fixes#12384
* Improve styling of poll option checkboxes/radio buttons
* Use more appropriate ARIA roles for poll options
* Allow switching between single and multiple choice from keyboard
* Coding style
* Avoid using .bind()
* Fix lost focus after modal closes
Regression caused by the use of the wicg-inert polyfill
* Fix regression introduced by wicg-inert
* Catch errors to please CodeClimate
* Add backend support for bookmarks
Bookmarks behave like favourites, except they aren't shared with other
users and do not have an associated counter.
* Add spec for bookmark endpoints
* Add front-end support for bookmarks
* Introduce OAuth scopes for bookmarks
* Add bookmarks to archive takeout
* Fix migration
* Coding style fixes
* Fix rebase issue
* Update bookmarked_statuses to latest UI changes
* Update bookmark actions to properly reflect status changes in state
* Add bookmarks item to single-column layout
* Make active bookmarks red
Fetching statuses from all followed accounts at once takes too long
within Postgres. Fetching them one by one and merging in Ruby
could be a lot less resource-intensive
Because the query for dynamically fetching the home timeline is so
heavy, we can no longer offer it when the home timeline is missing
* Add voters count to polls
* Add ActivityPub serialization and parsing of voters count
* Add support for voters count in WebUI
* Move incrementation of voters count out of redis lock
* Reword “voters” to “people”
* 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 expiring polls not being displayed as such in the WebUI
* Reset expiration state and timer when a poll changes
* Refactor timer logic in `_setupTimer`, only set expiration if props have changed
* Refactor and do not use deprecated React lifecycles
* Fix more visual issues with the audio player
- Add horizontal baseline in the middle of waveform
- Fix audio player colors in light theme
- Use audio element instead of web audio API
- Do not render any bars until the file is loaded
- Do not allow interactions with waveform until the file is loaded
* Fix code style issue
* Restore hashtag suggestions from local tag history
* Append local hashtag suggestions instead of prepending them
* Do not display inaccurate usage statistics for hashtags not retrieved from API
* Fixup
* Fix “read more” button behing hidden (regression from #11404)
This has the side-effect of putting the “Read more” button below possibly
trunctated polls instead of putting the poll below the “Read more”
* Remove dead code
- Focus first item when activated via keyboard
- When the dropdown menu closes, give back the focus to
the actual element which was focused prior to opening the menu
* Trap tab in privacy dropdown
* Give focus back to last focused element when privacy dropdown menu closes
* Actually give back focus to the element that had it before clicking the dropdown
* Allow selecting menu items with the space bar in status dropdown menus
* Fix modals opened by keyboard navigation being immediately closed
* Fix menu items triggering modal actions
* Add Tab trapping inside dropdown menu
* Give focus back to last focused element when status dropdown menu closes
