feat: deduplicate collab avatars based on id (#5309)

src/components/UserList.tsx

@@ -2,17 +2,51 @@ import "./UserList.scss";
 
 import React from "react";
 import clsx from "clsx";
+import { AppState, Collaborator } from "../types";
+import { Tooltip } from "./Tooltip";
+import { ActionManager } from "../actions/manager";
 
-type UserListProps = {
-  children: React.ReactNode;
+export const UserList: React.FC<{
   className?: string;
   mobile?: boolean;
-};
+  collaborators: AppState["collaborators"];
+  actionManager: ActionManager;
+}> = ({ className, mobile, collaborators, actionManager }) => {
+  const uniqueCollaborators = new Map<string, Collaborator>();
+
+  collaborators.forEach((collaborator, socketId) => {
+    uniqueCollaborators.set(
+      // filter on user id, else fall back on unique socketId
+      collaborator.id || socketId,
+      collaborator,
+    );
+  });
+
+  const avatars =
+    uniqueCollaborators.size > 0 &&
+    Array.from(uniqueCollaborators)
+      .filter(([_, client]) => Object.keys(client).length !== 0)
+      .map(([clientId, collaborator]) => {
+        const avatarJSX = actionManager.renderAction("goToCollaborator", [
+          clientId,
+          collaborator,
+        ]);
+
+        return mobile ? (
+          <Tooltip
+            label={collaborator.username || "Unknown user"}
+            key={clientId}
+          >
+            {avatarJSX}
+          </Tooltip>
+        ) : (
+          <React.Fragment key={clientId}>{avatarJSX}</React.Fragment>
+        );
+      });
 
-export const UserList = ({ children, className, mobile }: UserListProps) => {
   return (
     <div className={clsx("UserList", className, { UserList_mobile: mobile })}>
-      {children}
+      {avatars}
     </div>
   );
 };