Add thread mode button

app/javascript/flavours/glitch/features/compose/components/compose_form.jsx

@@ -34,6 +34,7 @@ import { NavigationBar } from './navigation_bar';
 import { PollForm } from "./poll_form";
 import { ReplyIndicator } from './reply_indicator';
 import { SecondaryPrivacyButton } from './secondary_privacy_button';
+import { ThreadModeButton } from './thread_mode_button';
 
 const allowedAroundShortCode = '><\u0085\u0020\u00a0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u2028\u2029\u0009\u000a\u000b\u000c\u000d';
 
@@ -315,6 +316,7 @@ class ComposeForm extends ImmutablePureComponent {
                 <ContentTypeButton />
                 <EmojiPickerDropdown onPickEmoji={this.handleEmojiPick} />
                 <FederationButton />
+                <ThreadModeButton />
                 <CharacterCounter max={maxChars} text={this.getFulltextForCharacterCounting()} />
               </div>
 

app/javascript/flavours/glitch/features/compose/components/thread_mode_button.jsx

@@ -0,0 +1,41 @@
+import { useCallback } from 'react';
+
+import { useIntl, defineMessages } from 'react-intl';
+
+import QuickreplyIcon from '@/material-icons/400-24px/quickreply.svg?react';
+import { changeComposeAdvancedOption } from 'flavours/glitch/actions/compose';
+import { IconButton } from 'flavours/glitch/components/icon_button';
+import { useAppSelector, useAppDispatch } from 'flavours/glitch/store';
+
+const messages = defineMessages({
+  enable_threaded_mode: { id: 'compose.enable_threaded_mode', defaultMessage: 'Enable threaded more' },
+  disable_threaded_mode: { id: 'compose.disable_threaded_mode', defaultMessage: 'Disable threaded more' },
+});
+
+export const ThreadModeButton = () => {
+  const intl = useIntl();
+
+  const isEditing = useAppSelector((state) => state.getIn(['compose', 'id']) !== null);
+  const active = useAppSelector((state) => state.getIn(['compose', 'advanced_options', 'threaded_mode']));
+
+  const dispatch = useAppDispatch();
+
+  const handleClick = useCallback(() => {
+    dispatch(changeComposeAdvancedOption('threaded_mode', !active));
+  }, [active, dispatch]);
+
+  const title = intl.formatMessage(active ? messages.disable_threaded_mode : messages.enable_threaded_mode);
+
+  return (
+    <IconButton
+      disabled={isEditing}
+      icon=''
+      onClick={handleClick}
+      iconComponent={QuickreplyIcon}
+      title={title}
+      active={active}
+      size={18}
+      inverted
+    />
+  );
+};

app/javascript/flavours/glitch/locales/en.json

@@ -22,6 +22,8 @@
   "compose.content-type.markdown_meta": "Format your posts using Markdown",
   "compose.content-type.plain": "Plain text",
   "compose.content-type.plain_meta": "Write with no advanced formatting",
+  "compose.disable_threaded_mode": "Disable threaded more",
+  "compose.enable_threaded_mode": "Enable threaded more",
   "compose_form.sensitive.hide": "{count, plural, one {Mark media as sensitive} other {Mark media as sensitive}}",
   "compose_form.sensitive.marked": "{count, plural, one {Media is marked as sensitive} other {Media is marked as sensitive}}",
   "compose_form.sensitive.unmarked": "{count, plural, one {Media is not marked as sensitive} other {Media is not marked as sensitive}}",

app/javascript/material-icons/400-24px/quickreply-fill.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M760-40v-200h-80v-240h200l-68 160h88L760-40ZM80-80v-720q0-33 23.5-56.5T160-880h640q33 0 56.5 23.5T880-800v240H600v320H240L80-80Z"/></svg>

app/javascript/material-icons/400-24px/quickreply.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M80-80v-720q0-33 23.5-56.5T160-880h640q33 0 56.5 23.5T880-800v240h-80v-240H160v525l46-45h394v80H240L80-80Zm80-240v-480 480ZM760-40v-200h-80v-240h200l-68 160h88L760-40Z"/></svg>