Use lists for room memberships

src/routes/spaces/[nrelay]/+layout.svelte

@@ -16,7 +16,7 @@
   import SpaceExit from "@app/components/SpaceExit.svelte"
   import SpaceJoin from "@app/components/SpaceJoin.svelte"
   import RoomCreate from "@app/components/RoomCreate.svelte"
-  import {userMembership, pullConservatively, roomsByUrl, decodeNRelay, GENERAL, MESSAGE} from "@app/state"
+  import {getMembershipRoomsByUrl, userMembership, pullConservatively, roomsByUrl, decodeNRelay, GENERAL, MESSAGE} from "@app/state"
   import {pushModal} from "@app/modal"
   import {makeSpacePath} from "@app/routes"
 
@@ -48,7 +48,7 @@
   let showMenu = false
 
   $: url = decodeNRelay($page.params.nrelay)
-  $: rooms = sort($userMembership?.roomsByUrl?.get(url) || [])
+  $: rooms = getMembershipRoomsByUrl(url, $userMembership)
   $: otherRooms = ($roomsByUrl.get(url) || []).filter(room => !rooms.concat(GENERAL).includes(room))
 
   onMount(() => {
@@ -74,7 +74,7 @@
             <ul
               transition:fly
               class="menu absolute z-popover mt-2 w-full rounded-box bg-base-100 p-2 shadow-xl">
-              {#if $userMembership?.roomsByUrl.has(url)}
+              {#if getMembershipRoomsByUrl(url, $userMembership)}
                 <li class="text-error">
                   <Button on:click={leaveSpace}>
                     <Icon icon="exit" />

src/routes/spaces/[nrelay]/[[room]]/+page.svelte

@@ -28,6 +28,7 @@
     GENERAL,
     tagRoom,
     MESSAGE,
+    getMembershipRoomsByUrl,
   } from "@app/state"
   import {addRoomMembership, removeRoomMembership} from "@app/commands"
 
@@ -46,8 +47,6 @@
   let loading = true
   let elements: Element[] = []
 
-  $: membership = $userMembership?.roomsByUrl.get(url) || []
-
   $: {
     elements = []
 
@@ -90,7 +89,7 @@
         <strong>{room}</strong>
       </div>
       {#if room !== GENERAL}
-        {#if membership.includes(room)}
+        {#if getMembershipRoomsByUrl(url, $userMembership).includes(room)}
           <Button class="btn btn-neutral btn-sm" on:click={() => removeRoomMembership(url, room)}>
             <Icon icon="arrows-a-logout-2" />
             Leave Room