[b84330808]

This PR will...

Set nextLoadPosition to lastCurrentTime instead of the playhead when a fragment request is aborted before anything has been buffered.

Why is this Pull Request needed?

_doFragLoad() moves nextLoadPosition to the end of the fragment it requests. When that request is aborted before hasEnoughToStart (for example by onLevelLoaded() after hls.loadLevel changes while the first fragment is loading), abortCurrentFrag() set nextLoadPosition to this.playhead, which before start is that same advanced position. The next fragment was then selected from the end of the aborted one, so the start position was never buffered.

Before start, lastCurrentTime holds the start position (set in startLoad() / setStartPosition()), so it is used instead, the same way onFragLoadEmergencyAborted() already does. Once started, the playhead is still used, since lastCurrentTime isn't updated during playback.

Are there any points in the code the reviewer needs to double check?

• The change is in BaseStreamController, so audio and subtitle stream controllers get it too.
• The existing abortCurrentFrag test in base-stream-controller.ts now also sets lastCurrentTime, since that is what the position comes from before start.

Resolves issues:

Resolves #8109

Checklist

• changes have been done against master branch, and PR does not conflict
• new unit / functional tests have been added (whenever applicable)
• API or design changes are documented in API.md

I used Claude Code to write this change.

[b84330808]

Thanks! Yes, lastCurrentTime does it. Before start it's the start position, so abortCurrentFrag() now uses it instead of the playhead, like onFragLoadEmergencyAborted() does. After start it still uses the playhead, since lastCurrentTime doesn't follow playback. I went with this rather than changing the playhead getter, which has a lot of other callers.

Replaced the second test: an idle tick picks the start fragment, it gets aborted, and the test checks playhead. Also had to set lastCurrentTime in the existing abortCurrentFrag test in base-stream-controller.ts.