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This update changes the logic of how we present modals. Previously presentedModals array could get out of sync with the actual app state because in case when parent VC is not mounted, presenting a modal would silently fail. In order to handle that we added additional update trigger from where the screen stack is mounted to a window. Second change that we added here addresses a problem of concurrent calls to update modals. As we cannot update presentedModals array synchrounously (all presentation callbacks are async even when no animation is involved), we need to block future updates unless the previous batch of updates is done. To do that we added a flag that prevents method re-entry. The flag is reset when all the presentation animations are over.