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David C. Lonie authored
The alpha mask returned by Matplotlib for mathtext renderings appears very dim when font size is small. This patch uses the same trick in MatplotlibMathTextUtilities as FreeTypeTools, which doesn't blend RGB values when the background alpha == 0. This gives a bolder appearance to the text, like it was before the text background color options were added. Also clamped the tprop opacity setters to [0., 1.] and updated a baseline that had small mathtext.
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