Set Revision expanded state only on first mount

Instead of recalculating the expanded state of a revision on any
`patch.revisions` variable change, we should just use it once on Mount
and then let the `Revision` component manage their expanded state
internally.

src/views/projects/Cob/Revision.svelte

@@ -32,7 +32,7 @@
   import Thread from "@app/components/Thread.svelte";
 
   export let baseUrl: BaseUrl;
-  export let expanded: boolean = false;
+  export let initialExpanded: boolean = false;
   export let rawPath: (commit?: string) => string;
   export let patchId: string;
   export let patchState: PatchState;
@@ -64,6 +64,7 @@
     | ((commentId: string, comment: string, embeds: Embed[]) => Promise<void>)
     | undefined;
 
+  let expanded = initialExpanded;
   const api = new HttpdClient(baseUrl);
   const latestEdit = revisionEdits.pop();
 

src/views/projects/Patch.svelte

@@ -888,7 +888,7 @@
                 partial(createReply, session.id, revision.revisionId)}
               patchId={patch.id}
               patchState={patch.state}
-              expanded={index === patch.revisions.length - 1}
+              initialExpanded={index === patch.revisions.length - 1}
               previousRevId={previousRevision?.id}
               previousRevOid={previousRevision?.oid}>
               {#if index === patch.revisions.length - 1}