sympy__sympy-13647

Matrix.col_insert() no longer seems to work correctly.

Verdict: the issue points to the file or function that was changed (Tier B).

It seems that `pos` shouldn't be [here](https://github.com/sympy/sympy/blob/master/sympy/matrices/common.py#L89).

The text points to the exact place to change: “It seems that `pos` shouldn't be [here](https://github.com/sympy/sympy/blob/master/sympy/matrices/common.py#L89).”

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