Select the general chat for a community when viewing it

src/stores/TagOrderStore.js

@@ -166,6 +166,25 @@ class TagOrderStore extends Store {
                     selectedTags: newTags,
                 });
 
+                if (!allowMultiple && newTags.length === 1) {
+                    // We're in prototype behaviour: select the general chat for the community
+                    const rooms = GroupStore.getGroupRooms(newTags[0])
+                        .map(r => MatrixClientPeg.get().getRoom(r.roomId))
+                        .filter(r => !!r);
+                    let chat = rooms.find(r => {
+                        const idState = r.currentState.getStateEvents("im.vector.general_chat", "");
+                        if (!idState || idState.getContent()['groupId'] !== newTags[0]) return false;
+                        return true;
+                    });
+                    if (!chat) chat = rooms[0];
+                    if (chat) {
+                        dis.dispatch({
+                            action: 'view_room',
+                            room_id: chat.roomId,
+                        });
+                    }
+                }
+
                 Analytics.trackEvent('FilterStore', 'select_tag');
             }
             break;