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When setting PG_COLOR to "always" or "auto" in a Windows terminal VT100-compatible, the colorization output was not showing up correctly because it is necessary to update the console's output handling mode. This fix allows to detect automatically if the environment is compatible with VT100. Hence, PG_COLOR=auto is able to detect and handle both compatible and non-compatible environments. The behavior of PG_COLOR=always remains unchanged, as it enforces the use of colorized output even if the environment does not allow it. This fix is based on an initial suggestion from Thomas Munro. Reported-by: Haiying Tang Author: Juan José Santamaría Flecha Reviewed-by: Michail Nikolaev, Michael Paquier, Haiying Tang Discussion: https://postgr.es/m/16108-134692e97146b7bc@postgresql.org Backpatch-through: 12