[librsvg] (15 commits) ...Merge branch 'text-bounds' into 'main'

[Marge Bot <marge-bot src gnome org>]

Summary of changes:

  4e3fe70... Add the Ahem font from the Web Platform Tests to the test s
  e61bb31... For the test suite, ensure only the testing FcConfig is bei
  ff1c99b... Add a test to ensure we are using the Ahem font correctly
  1526fd7... layout::TextSpan - store the layout's gravity here instead 
  eb93155... layout::TextSpan - compute the span's bbox and store it her
  ea55976... DrawingCtx::with_link_tag - separate into helper functions
  6aff484... layout::TextSpan - store the PDF link target here
  9058a34... StackingContext: store the link_target here for <a> element
  92dd748... PositionedSpan::draw - pass the ViewParams as an argument
  63da931... PositionedSpan::layout() - Just create the layout::TextSpan
  a671b7e... layout::TextSpan - carry the UserSpacePaintSources here
  df8e425... Pre-compute all the layout::TextSpan instead of doing them 
  426aede... Use the objectBoundingBox of the whole text element for eac
  8b9c2b8... Remove superfluous references
  463bcdf... Merge branch 'text-bounds' into 'main'