Incorrect column in stack trace with original file

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Expected behaviour

Stack trace contains locations with 1-based line and 1-based column.

Actual behaviour

Stack trace contains locations with 1-based line and 0-based column.

Environment Details

• Karma version (output of karma --version): 4.1.0
• Relevant part of your karma.config.js file: see the project

Steps to reproduce the behaviour

1. Clone https://github.com/segrey/karma-webpack-example
2. Run tests with npm test
3. Observe line

 at UserContext.<anonymous> (webpack:///test/specs/utils.spec.js:3:4 <- index.js:72:5)

The location in the original file (utils.spec.js:3:4) points to the correct 1-based line, but has wrong 1-based column (in fact it's 0-based column). Since lines and columns in stack traces are expected to be both 1-based, it should be utils.spec.js:3:5.

Please note that the location in the transpiled file (index.js:72:5) has correct 1-based column.

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Caused by https://github.com/karma-runner/karma/blob/v4.1.0/lib/reporter.js#L63 where 1-based column is passed to SourceMapConsumer.prototype.originalPositionFor(generatedPosition) expecting 0-based column.