deleted code:

def parse_lines_from_text(text):
    # largely taken from httpx's LineDecoder code
    lines = []
    last_chunk_of_text = ""
    while text:
        text_length = len(text)
        for idx in range(text_length):
            curr_char = text[idx]
            next_char = None if idx == len(text) - 1 else text[idx + 1]
            if curr_char == "\n":
                lines.append(text[: idx + 1])
                text = text[idx + 1: ]
                break
            if curr_char == "\r" and next_char == "\n":
                # if it ends with \r\n, we only do \n
                lines.append(text[:idx] + "\n")
                text = text[idx + 2:]
                break
            if curr_char == "\r" and next_char is not None:
                # if it's \r then a normal character, we switch \r to \n
                lines.append(text[:idx] + "\n")
                text = text[idx + 1:]
                break
            if next_char is None:
                last_chunk_of_text += text
                text = ""
                break
    if last_chunk_of_text.endswith("\r"):
        # if ends with \r, we switch \r to \n
        lines.append(last_chunk_of_text[:-1] + "\n")
    elif last_chunk_of_text:
        lines.append(last_chunk_of_text)
    return lines

[rest] add back in iter_text and iter_lines #20459

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