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font-patcher: Preserve padding around Braille glyphs
[why] Usually we scale symbols so that they are maximized within one 'cell' of the font. If we do this for the Braille glyphs the bottom dots from an upper line will (almost) touch the top dots of the next line. This is not useful. [how] We add padding around the Braille glyphs, to get about the same distance to the cell borders as the different dots in one glyph have to the other (~10 %, 5% on each side). Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
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