feat(preload): Wait for prefetches when preloading #7533
Merged
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Previously, the PreloadManager would consider a preload "finished" after a few major files like the manifest had been preloaded. It would start prefetching some segments, but wouldn't wait on it to notify the developer.
This PR changes the PreloadManager so that
PreloadManager.waitForFinish won't return until the prefetched segments have finished loading.
Because of that, this also better surfaces errors thrown during segment prefetching, when preloading.
Issue #7520