Resolve #3199

Fix the aspect ratio of animated GIF whose background is transparent.

The feature to pin column could hide the rightmost column, which is
specified with children property of ColumnsArea.

The user is likely to see the column when the property changed, so scroll
the area in such cases.

fix style

"©"削除処理をemojione_lightに移動

Fixes #4496

Use `text-align: unset` instead of `text-align: start` which Edge doesn't support for now.

Also remove default margin on Safari.

Previous and Next buttons

* fix(web_push_notifications): Send grouping title in welcome notification

* fix(web_push_notifications): Read message from last notification

* Re-add outline

* respect default of web browser

* i18n: update Persian translation

* i18n: fix quotes

URI.extract is too strong, not limited to URLs, matched real text.
Same issue was present in language detector.

* fix(media_modal): Keyboard navigation

* fix(column_back_button): Use native button

* fix(media_gallery): Keyboard navigation

* fix(status_content): Make CW content focusable

* Remove outline from focused toot

* change style

Empty a element is created when there is no business e-mail input.

* Set contact address as mailto link

To be able to copy long email address

* Set style for mailto link

* Use a fainted text color for <hr> elements in the landing page

* remove trailing whitespace

* fix(tabs_bar): Check if transition is necessary

* feat(tabs_bar): Only apply optimization for touch devices

* Fix autocomplete in two_factor.html.haml

* Fix autocomplete in registrations edit.html.haml

* Fix autocomplete in passwords edit.html.haml

* Fix autocomplete in _registration.html.haml

* Fix autocomplete in new.html.haml

* Fix autocomplete in show.html.haml

* Add autocomplete option to sessions new.html.haml

* Add autocomplete option to 2FA new.html.haml

* Add autocomplete option to 2FA show.html.haml

* fix(status_action_bar): Use aria-pressed for reblog and favourite button

* fix(column_back_button): Keyboard accessible

* fix(status_content): Make focusable and accessible

* fix(dropdown_menu): Use aria-expanded instead of aria-pressed

* fix(emoji_picker_dropdown): Use aria-expanded instead of aria-hidden

* feat(icon_button): Add aria-expanded

* fix(privacy_dropdown): Use aria-expanded instead of aria-hidden

* Count all URLs in text as 23 characters flat, do not count domain part of usernames

* Add new status text counting logic to web UI

* fix(modal_root): Read type from props, not from component

* fix(status_list): Do not user event.path

* fix(tabs_bar): Allow animation to end before navigating

* fix(tabs_bar): Do not use event.path

* Correction of misspellings

* Improve the OC version

* Improve of the OC version

* Improvement of OC version