Seek to previous or next subtitle line takes into account both imported subtitles.

[avc1657]

I've observed that when I import both Japanese and English subtitles, the seeking function takes into account both, even though the primary subtitle is the Japanese one. For instance, during the opening song where there's an English translation but no Japanese transcription, pressing the hotkey to jump to the next subtitle line doesn't go to the next Japanese line. Instead, it goes through the English secondary subtitle since it contains the translation of the opening. Shouldn't the seeking be focused on the main subtitle?