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access the data it doesn't point to.

the bottom of a window into account.

to stop reading, even if the form read sets point to a different
value when evaluated.

put the cursor.

(struct glyph_row): Add starts_in_middle_of_char_p and
ends_in_middle_of_char_p.
(MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P): Test row's
ends_in_middle_of_char_p flag.
(MATRIX_ROW_STARTS_IN_MIDDLE_OF_CHAR_P): Likewise.

it is originally unmodified.

padding glyph.

(re_match_2_internal): Use it and adjust the end_match_2 logic.