TTML subtitles positioning unstable
The attached file contains some embedded TTML subtitles generated from cc608 stream, roll-up live captioning style. Current vlc4 build (win64) does draw them correctly, but only when the window size is default-set from video size. As soon as window is resized, the subtitles start jumping around wildly either horizontally or vertically with each subtitle change. The subtitles are as basic as it gets - there's a single static region, no styling at all, just a bunch of text.