Ensure underline_position is viable
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@ -135,6 +135,7 @@ def render_special(underline=0, strikethrough=False, missing=False):
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s = set_font_family.state
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cell_width, cell_height, baseline = s.cell_width, s.cell_height, s.baseline
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underline_position, underline_thickness = s.underline_position, s.underline_thickness
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underline_position = min(underline_position, cell_height - underline_thickness)
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CharTexture = ctypes.c_ubyte * (cell_width * cell_height)
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ans = CharTexture if missing else CharTexture()
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