bug of "pango_layout_move_cursor_visually"

[王旭光 <ninesunqian 163 com>]

I find a bug of  "pango_layout_move_cursor_visually":
the layout text is "012345" , I move cursor from (index:100, trailing:100) to left.  I first get (5, 5). I think it should be (5, 1), that is the rightest position.

the code is:
                int index = 100;
                int trailing = 100;
                int newIndex = 5;
                int newTrailing = 5;

                while (newIndex != -1)
                {
                    pango_layout_move_cursor_visually (layout, true, index, trailing, -1, &newIndex, &newTrailing);
                    MyTrace ("[%d,  %d]\n", newIndex, newTrailing);
                    index = newIndex;
                    trailing = newTrailing ;
                }

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