Fix bug #11860 with displaying composite RTL characters on MS-Windows.
src/w32uniscribe.c (uniscribe_shape): Fix producing gstring components for RTL text. Adjust X-OFFSET of each non-base glyph for the width of the base character, according to what x_draw_composite_glyph_string_foreground expects. Generate WADJUST value according to composition_gstring_width's expectations, to produce correct width of the composed character. Reverse the sign of the DU offset produced by ScriptPlace.
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