Implement mouse highlight for bidi-reordered lines.
xdisp.c (fast_find_string_pos): #ifdef away, not used anymore. (mouse_face_from_string_pos): New function, replaces fast_find_string_pos. (note_mouse_highlight): Call it instead of fast_find_string_pos. (note_mode_line_or_margin_highlight): Support bidi-reordered strings and R2L glyph rows. Fix comments. (note_mouse_highlight): When bidi reordering is turned on in a buffer, call next-single-property-change and previous-single-property-change with last argument nil. Clear mouse highlight when mouse pointer is in a R2L row on the stretch glyph that stands for no text beyond the line end. (row_containing_pos): Don't return too early when CHARPOS is in a bidi-reordered continued line. Return immediately when the first hit is found in a line that is not continued, or when an exact match for CHARPOS is found. (rows_from_pos_range): New function. (mouse_face_from_buffer_pos): Use it instead of calling row_containing_pos for START_CHARPOS and END_CHARPOS. Rewrite the function to support mouse highlight in bidi-reordered lines and not to assume that START_CHARPOS is always in mouse_face_beg_row. If necessary, swap mouse_face_beg_row and mouse_face_end_row so that the former is always above the latter or identical to it. (show_mouse_face): Support drawing highlighted R2L lines. (coords_in_mouse_face_p): New function, bidi-aware. (cursor_in_mouse_face_p, note_mouse_highlight, erase_phys_cursor): Call it instead of comparing with mouse-face members of dpyinfo. (note_mode_line_or_margin_highlight): Fix confusingly swapped usage of hpos and vpos.
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