* 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 “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
* [WiP] Show host for “misleading” links
* Disallow misleading targets which domain names are prefixes of link text
* Move decodeIDNA to app/javascript/mastodon/utils
* Add support for international domain names
* Change link origin tag color to darker text color
* Handle links to domains starting with www. as shortened by Mastodon
* [WiP] Ignore links that cannot be misread as URLs, rewrite other links
* Play animated custom emoji on hover in status
* Play animated custom emoji on hover in display names
* Play animated custom emoji on hover in bios/bio fields
* Add support for animation on hover on public pages emojis too
* Fix tests
* Code style cleanup
* Put poll options behind CWs in WebUI
* Put polls behind CWs on public pages
* Add poll icon to public pages CWs
* Revert to not showing an icon in the CW button
* 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
This includes clicks on hashtags, mentions, display names and media in the
timeline; and usernames in reply-indicator, detailed status, and the boost
modal.
* Redesign the landing page, mount public timeline on it
* Adjust the standalone mounted component to the lacking of router
* Adjust auth layout pages to new design
* Fix tests
* Standalone public timeline polling every 5 seconds
* Remove now obsolete translations
* Add responsive design for new landing page
* Address reviews
* Add floating clouds behind frontpage form
* Use access token from public page when available
* Fix mentions and hashtags links, cursor on status content in standalone mode
* Add footer link to source code
* Fix errors on pages that don't embed the component, use classnames
* Fix tests
* Change anonymous autoPlayGif default to false
* When gif autoplay is disabled, hover to play
* Add option to hide the timeline preview
* Slightly improve alt layout
* Add elephant friend to new frontpage
* Display "back to mastodon" in place of "login" when logged in on frontpage
* Change polling time to 3s
* Update links in status content on update as well as mount
Fixes occasional bugs with mentions and hashtags not being set to open in a new column like they should, and instead opening in a new page
* use classList instead of raw className
- Media toots are no longer auto-collapsed if the media is behind a CW
- Display names no longer appear clickable when a toot is collapsed
- Fixed#36 by adding reduplicating the media icon inside the SHOW
MORE/LESS
- Use plaintext
- Strip out URLs
- Strip out mentions
- Strip out hashtags
- Strip out whitespace from "overall" count
- Consistent between JS and Ruby
Matt Panaro