ModifyCacheLifetimeForPageEvent triggert earlier than expected #116
Description
In TYPO3 v13, the extension uses \TYPO3\CMS\Frontend\Cache\CacheLifetimeCalculator::calculateLifetimeForPage to get the maximum cache lifetime for a page. Within this method, event listeners for \TYPO3\CMS\Frontend\Event\ModifyCacheLifetimeForPageEvent are executed.
Without this extension, the listeners get executed after all content generation is done. But because of using the CacheLifetimeCalculator, the listeners are executed during dataProcessing (mostly for the page Fluidtemplate I guess). This alone might not be a problem, the the calculated lifetime is cached inside the runtime cache. Therefore the listeners aren't executed after content generation because the cache entry already exists.
This can be problematic when during content creation, information is gathered for calculating the page cache lifetime.
I guess this behavior does not affect many installations, but might be the reason for cache problems that are really hard to reproduce.