When we transform a refspec with a component containing a glob, then we simply copy over the component until the next separator from the matching ref. E.g. if we have a ref "refs/heads/foo/bar" and a refspec "refs/heads/*/bar:refs/remotes/origin/*/bar", we: 1. Copy over everything until hitting the glob from the <dst> part: "refs/remotes/origin/". 2. Strip the common prefix of ref and <src> part until the glob, which is "refs/heads/". This leaves us with a ref of "foo/bar". 3. Copy from the ref until the next "/" separator, resulting in "refs/remotes/origin/foo". 4. Copy over the remaining part of the <dst> spec, which is "bar": "refs/remotes/origin/foo/bar". This worked just fine in a world where globs in refspecs were restricted such that a globbing component may only contain a single "*", only. But this restriction has been lifted, so that a glob component may be nested between other characters, causing the above algorithm to fail. Most notably the third step, where we copy until hitting the next "/" separator, might result in a wrong transformation. Given e.g. a ref "refs/gbranchg/head" and a refspec "refs/g*g/head:refs/remotes/origin/*", we'd also be copying the "g" between "branch" and "/" and end up with the wrong transformed ref "refs/remotes/origin/branchg". Instead of copying until the next component separator, we should copy until we hit the pattern after the "*". So in the above example, we'd copy until hitting the string "g/head".
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