Initial reimplementation of calculating line edge positions in bidi lines.
dispextern.h (struct glyph_row): New members minpos and maxpos. (MATRIX_ROW_START_CHARPOS, MATRIX_ROW_START_BYTEPOS) (MATRIX_ROW_END_CHARPOS, MATRIX_ROW_END_BYTEPOS): Reference minpos and maxpos members instead of start.pos and end.pos, respectively. xdisp.c (display_line): Compare IT_CHARPOS with the position in row->start.pos, rather than with MATRIX_ROW_START_CHARPOS. (cursor_row_p): Use row->end.pos rather than MATRIX_ROW_END_CHARPOS. (try_window_reusing_current_matrix, try_window_id): Use ROW->minpos rather than ROW->start.pos. (init_from_display_pos, init_iterator): Use EMACS_INT for character and byte positions. (find_row_edges): Renamed from find_row_end. Accept additional arguments for minimum and maximum buffer positions seen by display_line for this row. Don't use iterator to find the position following the maximum one; instead, increment the position found by display_line directly. (display_line): Record minimum and maximum buffer positions for glyphs in this row. Record the position of the newline that terminates the line. dispnew.c (increment_row_positions, check_matrix_invariants): Increment and check row->start.pos and row->end.pos, in addition to MATRIX_ROW_START_CHARPOS and MATRIX_ROW_END_CHARPOS.
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