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A bunch of text layout fixes

Federico Mena Quintero requested to merge federico/librsvg:806-text-anchor-chunk into main

Mainly this is the fixes #806 (closed), and also some problems that I found while debugging that.

The context is making https://commons.wikimedia.org/wiki/File:S-Bahn_RheinNeckar2020.svg render correctly - #806 (closed) is part of that. With this MR, that file finally renders with the correct text layout!

  • Inside <text>, first lay out each chunk's spans according to text direction, and apply text-anchor at the end to the whole chunk.
  • As a hack for librsvg's lack of support for multiple dx/dy values, apply a chunk's dx/dy independently of the layout of its spans. That is, lay out spans, then apply text-anchor, then apply dx/dy from the chunk.

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