Port new workspace logic to gpui2, uncomment most of the workspace2 tests

crates/collab_ui2/src/chat_panel/message_editor.rs

@@ -14,14 +14,8 @@ use std::{sync::Arc, time::Duration};
 const MENTIONS_DEBOUNCE_INTERVAL: Duration = Duration::from_millis(50);
 
 lazy_static! {
-    static ref MENTIONS_SEARCH: SearchQuery = SearchQuery::regex(
-        "@[-_\\w]+",
-        false,
-        false,
-        Default::default(),
-        Default::default()
-    )
-    .unwrap();
+    static ref MENTIONS_SEARCH: SearchQuery =
+        SearchQuery::regex("@[-_\\w]+", false, false, false, Vec::new(), Vec::new()).unwrap();
 }
 
 pub struct MessageEditor {