Run shadows and glows (a:rPr/a:effectLst outerShdw, glow) were read but
never drawn. The text layout now carries them on each glyph run (colours
resolved, sizes scaled with autofit) and the renderer draws every run's
shadow, then every glow, blurred, under the text. A text glow is solid to
about a third of its radius past the letters and fades out by two thirds,
as measured on PowerPoint's export. needs_filters also looks at text
effects (runs, list styles, master text styles), so they render with the
blur filter.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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