Seems to be broken. Presentations will not launch (clicking play button) and the Admin->Configuration page does not render if the revealjs plugin is enabled.

`Fatal error: Array and string offset access syntax with curly braces is no longer supported in /usr/local/www/dokuwiki/lib/plugins/revealjs/renderer.php on line 480

dokuwiki\Exception\FatalException: Array and string offset access syntax with curly braces is no longer supported

An unforeseen error has occured. This is most likely a bug somewhere. It might be a problem in the revealjs plugin.`

Trying to render a page tagged with ~~REVEAL~~ throws a number of errors

`Warning: Undefined array key "hid" in /usr/local/www/dokuwiki/inc/html.php on line 114'

Playing the presentation results in a Fatal error

Fatal error: Array and string offset access syntax with curly braces is no longer supported in /usr/local/www/dokuwiki/lib/plugins/revealjs/renderer.php on line 480

Trying to render a page tagged with ~~REVEAL~~ throws a number of errors

`Warning: Undefined array key "hid" in /usr/local/www/dokuwiki/inc/html.php on line 114'

Playing the presentation results in a Fatal error

Fatal error: Array and string offset access syntax with curly braces is no longer supported in /usr/local/www/dokuwiki/lib/plugins/revealjs/renderer.php on line 480

Found the same issue. I think it is related with the change of PHP 7.4 to 8.1 version, which is incopatible with Reveal.js.

Do the authors @splitbrain @selfthinker @Laynee @ogobrecht @neuralyzer have the intention of updating the plugin?
It would be wonderful 🙏