Reject out-of-order op ack messages (#23163)

GitOrigin-RevId: 50c48282e93925a8c40be72e8fc0b8a72d39d82d

services/web/frontend/js/vendor/libs/sharejs.js

@@ -1106,7 +1106,7 @@ export const { Doc } = (() => {
                     meta: { msg, version: this.version }
                   }
                 })
-                // return // TODO: enable this
+                return
               }
             } else {
               if (msg.v < this.version) {