[SID-2056] React SDK: back button blocked

[ikovic]

Description

YouTrack issue

When the last subscriber of an event type would unsubscribe, the event buffer was supposed to buffer any future instances of this event type and replay them to the first subscriber. Due to a bad state check this wouldn't happen if you had already subscribed to this event type, unsubscribed and then subscribed again.

This issue is now fixed and a unit test was added that confirms this.

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have generated the new version of the docs website and smoke tested it
• I have checked that my changes haven't caused semantic errors in the existing docs
• I have generated a changeset if my change affects the published packages

[github-actions]

Bundle size comparison

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
main.js	+0.03%	409.04 kB	409.14 kB	+0.04%	107.41 kB	107.45 kB
style.css	=	38.27 kB	38.27 kB	=	6.50 kB	6.50 kB
main.d.ts	=	4.73 kB	4.73 kB	=	1.15 kB	1.15 kB

Generated by 🚫 dangerJS against b5b8852

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Latest commit:	b5b8852
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Preview URL:	https://6ab043c8.website-react-storybook.pages.dev
Branch Preview URL:	https://sid-2056-back-button-block.website-react-storybook.pages.dev

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