Allow maintaining a different right panel width for thread panels (#11064)

* Move Room context threadId our of RoomView state

* Allow maintaining a different right panel width for thread panels

* Fix types

* Fix types

* Add tests

* Increase coverage

* Increase coverage

* Add comments

* Update src/components/structures/MainSplit.tsx

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

---------

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

src/contexts/RoomContext.ts

@@ -29,7 +29,11 @@ export enum TimelineRenderingType {
     Pinned = "Pinned",
 }
 
-const RoomContext = createContext<IRoomState>({
+const RoomContext = createContext<
+    IRoomState & {
+        threadId?: string;
+    }
+>({
     roomLoading: true,
     peekLoading: false,
     shouldPeek: true,
@@ -39,6 +43,7 @@ const RoomContext = createContext<IRoomState>({
     showApps: false,
     isPeeking: false,
     showRightPanel: true,
+    threadRightPanel: false,
     joining: false,
     showTopUnreadMessagesBar: false,
     statusBarVisible: false,