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Brad King authored
Since commit c76c1ea2 (find_program: Consider CWD only for paths with separator, 2018-05-31, v3.13.0-rc1~413^2) we accidentally convert the leading `//` to just `/` on results with Windows network paths. This was caused by `CollapseCombinedPath` being less robust than `CollapseFullPath`. Restore use of the latter but in a way that preserves the requirement of the above commit to support candidates that are themselves absolute. Fixes: #19049 Issue: #19050
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