Port 8bf3e750ab to glitch-soc

The rationale behind this is that if the user wants to report violent media,
they might not want to see it repeatedly. The “sensitive” property is still
kept, displaying different messages for hidden media depending on whether
they are marked as sensitive.

Port bddb330a8a to glitch-soc

Port c88e12fca6 to glitch-soc

This reverts commit 553cc28240.

This reverts commit 32974a58dc.

Port from 3c5006ec7f

Port ba917e15f6 to glitch-soc

Port 74dae9458d and related to glitch-soc

Port the SCSS changes from cb74c0cfe4 to glitch-soc

Port SCSS changes from 5acd5315f2 to glitch-soc

Port 8c601b54cc to glitch-soc

Port 58852695c8 to glitch-soc

* Prevent Enter keypresses from triggering dropdown display toggle twice
* Give focus to first/selected item of dropdown menus
* Implement keyboard navigation in generic dropdown menus

Partial port from ef7d64c801 to glitch-soc

Port ad5d3134e4 to glitch-soc

Port 660cb058e1 to glitch-soc flavour

glitch-soc-style still in backup, both sharing the same SCSS style

Signed-off-by: Marcin Mikołajczak <me@m4sk.in>

As we are already using the new getSnapshotBeforeUpdate lifecycle method,
we apparently cannot use the deprecated ones at all in this component.

Port 53b1d88873 to glitch-soc

Port 23106844a1 to glitch-soc

Port 597948fb13 to glitch-soc

Backport 386365090c

Inspired from b6003afcdb but using component
properties instead of redux store for hidden/revealed state.

Backports daefbd66a6

Port ffb2b8ef8c to glitch-soc

Port 08e4c78e78 to glitch-soc.

SCSS fix inspired by 69f13e7bca.