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  cinera.c: Fix colouring of topic dots

  Miblo tagged this 2024-02-21 20:52:34 +00:00 | 1 commits to master since this tag

  The colour computed for topic dots and put into cinera_topics.css in HSL
  format has its lightness value modified depending on whether it's on a
  dark or light background. Web browsers do not tell us an element's
  computed colour in HSL format, but in RGB, so we would need to convert
  it from RGB to HSL when setting the lightness. Previously, this
  conversion was busted, calculating too small a value for the saturation.

  This commit obviates the need for any RGB→HSL conversion by writing the
  hue and saturation values as attributes to the elements, which the
  function responsible for setting the lightness may use directly.

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