Fix bug #9549 with longlines-show-hard-newlines.
src/xdisp.c (set_cursor_from_row): If the row ends in a newline from a display string, extend search for cursor position to end of row. (find_row_edges): If the row ends in a newline from a display string, increment its MATRIX_ROW_END_CHARPOS by one. Handle the case of a display string with multiple newlines.
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