Add support for --carry-initial-prompt #3395
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This PR is bringing over the
--carry-initial-promptflag from the python library (openai/whisper#2343)By default, an
--prompt(initial prompt) is only used for the first decoding window; subsequent windows rely on the text generated so far for continuity. When you pass--carry-initial-prompt, the initial prompt tokens are explicitly prepended to every internal decode window. This mirrors the Python reference implementation'scarry_initial_promptbehavior and can help enforce custom vocabulary or style throughout long transcriptions. Trade‑off: it may slightly reduce the model's ability to adapt dynamically to newly generated context (can increase risk of repetitions if the prompt is long). If the combined size of the carried initial prompt and the rolling context exceeds half the model text context, the leftmost (oldest) part of the initial prompt is truncated to fit.