Add style for indeterminate state checkbox

skkzshrequested to merge
gitlab-community/gitlab-org/gitlab:skkzsh/indeterminate-style into master

Why

!240908 (merged) implemented checkbox rendering for org-mode ([X], [ ], [-]).

The [-] marker sets data-indeterminate="true" on the element, but there's no CSS to actually show it. Right now it looks identical to an unchecked box.

What this MR does

Adds CSS to render a dash icon for indeterminate checkboxes.

Note that this doesn't touch Markdown task list styling.

Screenshots

Visually confirmed that the indeterminate ([-]) checkbox appears as expected in GDK-in-a-box:

Before After
indeterminate-unstyled indeterminate-styled

Sources:

- [-] Prepare release
  - [X] Update changelog
  - [ ] Review merge requests

Related

Notes

  • I don't work on the frontend regularly — feel free to tweak the CSS as needed.
  • No docs updates included — this area isn't well covered by existing documentation. If there are specific docs that should be updated, please flag them.

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Edited by skkzsh

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