[patch] Get the position of the first non-white character in the current line getpos('^'), col('^')

[itchyny]

Hi list, this is a small patch to grab the column number of the first non-white
character in the current line. I wrote because found in the todo list.

https://gist.github.com/itchyny/22e9871b15eec445ddb8c3a7451222af

Regards,
Ken Hamada (aka itchyny on GitHub)

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