Fix: Right panel keeps showing chat when unmaximizing widget. (#11697)

* Right panel chat closes when unmaximising widget

* Basic right panel tests added

* Accessible selectors used for new tests

* Test added to check if chat exists in right panel

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Co-authored-by: Manan Sadana <manan.sadana@cnhteam.onmicrosoft.com>
Co-authored-by: Florian Duros <florianduros@element.io>

src/components/structures/RoomView.tsx

@@ -539,6 +539,9 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
         if (this.context.widgetLayoutStore.hasMaximisedWidget(this.state.room)) {
             // Show chat in right panel when a widget is maximised
             this.context.rightPanelStore.setCard({ phase: RightPanelPhases.Timeline });
+        } else {
+            // Close the chat in right panel when the widget is unmaximised
+            this.context.rightPanelStore.togglePanel(null);
         }
         this.checkWidgets(this.state.room);
     };