Constant GLYPH_EMPTY

pub const GLYPH_EMPTY: Glyph = ffi::PANGO_GLYPH_EMPTY; // 268_435_455u32

A PangoGlyph value that indicates a zero-width empty glpyh.

This is useful for example in shaper modules, to use as the glyph for various zero-width Unicode characters (those passing is_zero_width()).