### GSUB–1: Space Isn’t Nothing

The font for this test case has a contextual alternates feature in its GSUB table that substitutes a by a.alt if followed by a space. Some versions of Adobe InDesign had a bug where space was treated like an empty substitution context. If your implementation is correct, you should see two different glyphs in the rendering: the first letter should have an overbar, the second letter should not.

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