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Answers come from these docs, with links to the pages they’re from.

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Backlinks

A backlink is a comment on an issue or pull request that links back to the board, so people on GitHub can find where it was discussed.

Select one or more cards and choose Backlink (comment with a link to this board, ⌥ K). Add an optional Note, and Stage N comments. Like every action, nothing is written until someone pushes.

What the comment says

Section titled “What the comment says”

Your note, if you wrote one, then:

This is on unpic 5.0 planning in Tack, in the Now section.

The board’s name links to the board. The section is only mentioned if the card is in a titled section.

Snapshots

Section titled “Snapshots”

Include a snapshot of the board adds an image of the board around the item, linking to the board. It’s off by default, and Tack remembers your choice for each board, in your browser. Nothing is drawn or uploaded unless it’s on.

  • The image is drawn in your browser, from the board at rest: no selection, cursors, toolbars or staged marks. It frames the item and the shapes near it, whole, with even space around them.
  • When the comments go to more than one audience, the panel shows the versions of the image, one for each (“For public repos”, “For acme/vault”): each comment gets the one its readers can see.
  • Private cards stay private. A comment in a public repository can be read by anyone, so cards from private repositories are replaced in its image by a “Private card” placeholder. A comment in a private repository gets an image of its own, keeping that repository’s cards. The panel says when it’s hiding something: “A card from a private repository is hidden in this image, since the comment is public.”
  • Snapshots are stored on your instance and served at /snapshots/….png, with an unguessable name that says nothing about the board, so GitHub’s image proxy can fetch them. Each is at most 1.5 MB and 4096 pixels a side, and a board can hold 1000.

If the image shows as broken on GitHub, your instance’s /snapshots/ address isn’t reachable from the internet.