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* src/location.c (min_int, columns): New. (location_caret): Compute the line width. Based on it, compute how many columns must be skipped before the quoted location and truncated after, to fit the sceen width. * tests/local.at (AT_QUELL_VALGRIND): Transform into... (AT_SET_ENV_IF, AT_SET_ENV): these. Define COLUMNS to protect the test suite from the user's environment.