Use a fallback shaper if no engine is found for a range, the fallback

2000-12-14  Havoc Pennington  <hp@redhat.com>

        * pango/pango-context.c (add_engines): Use a fallback shaper if
        no engine is found for a range, the fallback shaper shapes to
        glyphs of 0. This is just to let other code depend on the
        invariant that there's a shape engine for all characters.

        * tests/all-unicode.txt: Huge file containing all Unicode
        characters, for robustness testing. Not in EXTRA_DIST
        for now, not sure we should torture people that way...

        * pango/fonts.c (pango_font_find_shaper): remove the assert that
        we found a shaper, and instead let things fall back to the fallback
        shaper

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