Implement GUI display of R2L lines, fix TTY display of R2L lines.
xdisp.c [HAVE_WINDOW_SYSTEM]: Add prototype for append_stretch_glyph. (set_cursor_from_row) <cursor_x>: Remove unused variable. Fix off-by-one error in computing x at end of text in the row. (append_stretch_glyph): In reversed row, prepend the glyph rather than append it. Set resolved_level and bidi_type of the glyph. (extend_face_to_end_of_line): If the row is reversed, prepend a stretch glyph whose width is such that the rightmost glyph will be drawn at the right margin of the window. Fix off-by-one error on TTY frames in testing whether a line needs face extension. Fix face extension at ZV. If this is the last glyph row, use DEFAULT_FACE_ID, to avoid painting the rest of the window with the region face. (set_cursor_from_row, display_line): Use MATRIX_ROW_CONTINUATION_LINE_P instead of testing value of row->continuation_lines_width. (next_element_from_buffer): Don't call bidi_paragraph_init if we are at ZV. Fixes a crash when reseated to ZV by try_window_reusing_current_matrix. (display_and_set_cursor, erase_phys_cursor): Handle negative HPOS, which happens with R2L glyph rows. Fixes a crash when inserting a character at end of an R2L line. (set_cursor_from_row): Don't be fooled by truncated rows: don't treat them as having zero-width characters. Improve comments. Don't reverse pos_before and pos_after for reversed glyph rows. Set cursor.x to negative value when the cursor might be on the left fringe. (IT_OVERFLOW_NEWLINE_INTO_FRINGE): For R2L lines, consider the left fringe, not the right one. (notice_overwritten_cursor, draw_phys_cursor_glyph) (erase_phys_cursor): For reversed cursor_row, support cursor on the left fringe. fringe.c (update_window_fringes): For R2L rows, swap the bitmaps of continuation indicators on the fringes. (draw_fringe_bitmap): For reversed glyph rows, allow cursor on the left fringe. w32term.c (w32_draw_window_cursor): For reversed glyph rows, draw cursor on the left fringe. xterm.c (x_draw_window_cursor): For reversed glyph rows, draw cursor on the left fringe. dispnew.c (update_text_area): Handle reversed desired rows when the cursor is on the left fringe. (set_window_cursor_after_update): Limit cursor's hpos by -1 from below, not by 0, for when the cursor is on the left fringe. xdisp.c (unproduce_glyphs): New function. (display_line): Use it when produced glyphs are discarded from R2L glyph rows. (append_composite_glyph): In R2L rows, prepend the glyph rather than appending it. term.c (append_composite_glyph): In R2L rows, prepend the glyph rather than append it. Set up the resolved_level and bidi_type attributes of the appended glyph. (produce_special_glyphs): Mirror the backslash continuation character in R2L lines.
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