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Previously, the Arthur backend would use Splash code to do its font rendering. That was not a satisfactory solution: Qt can do font rendering directly. Also, the Splash font rendering in the Arthur code had a few bugs, which lead to legible-but-not-pretty fonts. This patch replaces the Splash font rendering by Qt font rendering. Some Splash code will have to remain, because Qt seems unable to do the proper charcode-to-glyph-index transformations. I took a lot of inspiration from Mihai Niculescu's patch at https://lists.freedesktop.org/archives/poppler/2013-June/010370.html That's why the patch adds Mihai's name in the copyright list.
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