There is an elegant way to link from the wiki and bug tracker called Trac to GitHub by means of changeset links. Unfortunately, Trac’s documentation on WikiFormatting and on TracLinks does not currently describe this. But one project which I use, MacPorts, uses Trac to track MacPorts bugs and to host wiki documentation. They prefer that contributors use these changeset links rather than URLs when referring to MacPorts on GitHub. So, this is the documentation for these changeset links, in a form which I wish was in the main Trac documentation. It is here to remind me. Maybe it will also help others searching for how to do this.

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