Move ResizerNotifier into SDKContext (#30939)

* Move ResizerNotifier into SDKContext

so we don't have to pass it into RoomView

* Fix test

* Unused import

* Add tests

* Remove a bunch of resizeNotifier props

* Remove more resizeNotifier props

* Add resizenotifier to test

* Add more sdkcontext wrappers in tests

* More sdkcontext wrappers

* Even more sdkcontext wrappers

* Add test to make sonarcloud happy

* Context isn't always there unlike props

* Test actual resizing too

* Remove commented line

src/contexts/SDKContext.ts

@@ -24,6 +24,7 @@ import { WidgetLayoutStore } from "../stores/widgets/WidgetLayoutStore";
 import { WidgetPermissionStore } from "../stores/widgets/WidgetPermissionStore";
 import { OidcClientStore } from "../stores/oidc/OidcClientStore";
 import WidgetStore from "../stores/WidgetStore";
+import ResizeNotifier from "../utils/ResizeNotifier";
 
 // This context is available to components under MatrixChat,
 // the context must not be used by components outside a SdkContextClass tree.
@@ -64,6 +65,7 @@ export class SdkContextClass {
     protected _TypingStore?: TypingStore;
     protected _UserProfilesStore?: UserProfilesStore;
     protected _OidcClientStore?: OidcClientStore;
+    protected _ResizeNotifier?: ResizeNotifier;
 
     /**
      * Automatically construct stores which need to be created eagerly so they can register with
@@ -171,6 +173,16 @@ export class SdkContextClass {
         return this._OidcClientStore;
     }
 
+    // This is getting increasingly tenuous to have here but we still have class components so it's
+    // awkward to consume multiple contexts in them. This should be replaced with ResizeObservers
+    // anyway really.
+    public get resizeNotifier(): ResizeNotifier {
+        if (!this._ResizeNotifier) {
+            this._ResizeNotifier = new ResizeNotifier();
+        }
+        return this._ResizeNotifier;
+    }
+
     public onLoggedOut(): void {
         this._UserProfilesStore = undefined;
     }