Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/concerns/sign_in_token_authentication_concern.rb`:
  Conflict due to glitch-soc's theming system.
  Ported upstream changes.
- `app/controllers/concerns/two_factor_authentication_concern.rb`:
  Conflict due to glitch-soc's theming system.
  Ported upstream changes.

app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js

@@ -203,7 +203,7 @@ class EmojiPickerMenu extends React.PureComponent {
     if (!emoji.native) {
       emoji.native = emoji.colons;
     }
-    if (!event.ctrlKey) {
+    if (!(event.ctrlKey || event.metaKey)) {
       this.props.onClose();
     }
     this.props.onPick(emoji);