feat: introduce new front-end UI button for cross-posting, hide move on topics in remote cids

- Hide the ability to select remote cids in topic move category search
- Add a new option to category search: 'localOnly'; pretty self descriptive.

src/api/search.js

@@ -66,6 +66,7 @@ async function findMatchedCids(uid, data) {
 		query: data.search,
 		qs: data.query,
 		paginate: false,
+		localOnly: data.localOnly,
 	});
 
 	let matchedCids = result.categories.map(c => c.cid);

src/categories/search.js

@@ -6,12 +6,14 @@ const privileges = require('../privileges');
 const activitypub = require('../activitypub');
 const plugins = require('../plugins');
 const db = require('../database');
+const utils = require('../utils');
 
 module.exports = function (Categories) {
 	Categories.search = async function (data) {
 		const query = data.query || '';
 		const page = data.page || 1;
 		const uid = data.uid || 0;
+		const localOnly = data.localOnly || false;
 		const paginate = data.hasOwnProperty('paginate') ? data.paginate : true;
 
 		const startTime = process.hrtime();
@@ -21,6 +23,9 @@ module.exports = function (Categories) {
 		}
 
 		let cids = await findCids(query, data.hardCap);
+		if (localOnly) {
+			cids = cids.filter(cid => utils.isNumber(cid));
+		}
 
 		const result = await plugins.hooks.fire('filter:categories.search', {
 			data: data,

src/views/partials/topic/topic-menu-list.tpl

@@ -15,9 +15,15 @@
 	<a component="topic/unpin" href="#" class="dropdown-item rounded-1 d-flex align-items-center gap-2 {{{ if !pinned }}}hidden{{{ end }}}" role="menuitem"><i class="fa fa-fw fa-thumb-tack fa-rotate-90 text-secondary"></i> [[topic:thread-tools.unpin]]</a>
 </li>
 
+{{{ if isNumber(cid) }}}
 <li>
 	<a component="topic/move" href="#" class="dropdown-item rounded-1 d-flex align-items-center gap-2" role="menuitem"><i class="fa fa-fw fa-arrows text-secondary"></i> [[topic:thread-tools.move]]</a>
 </li>
+{{{ end }}}
+
+<li>
+	<a component="topic/crosspost" href="#" class="dropdown-item rounded-1 d-flex align-items-center gap-2" role="menuitem"><i class="fa fa-fw fa-clone text-secondary"></i> [[topic:thread-tools.crosspost]]</a>
+</li>
 
 <li>
 	<a component="topic/merge" href="#" class="dropdown-item rounded-1 d-flex align-items-center gap-2" role="menuitem"><i class="fa fa-fw fa-code-fork text-secondary"></i> [[topic:thread-tools.merge]]</a>