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bpython breaks line with ANSI escape code #670

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@laike9m

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@laike9m

This can be easily reproduced by typing

print('\033[31mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[3
1mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[3
1mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m\033[31mOK\033[0m')

In bpython
image

In Python
image

I guess when calculating the length of output, bpython counts all chars, but not all chars are visible, thus leading to this bug.

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