(BLOCK_ALIGN, BLOCK_BYTES, ABLOCKS_PADDING, ABLOCKS_SIZE)
(ABLOCKS_BYTES, ABLOCK_ABASE, ABLOCKS_BUSY, ABLOCKS_BASE): New macros.
(struct ablock, struct ablocks): New types.
(free_ablock): New global var.
(lisp_align_malloc, lisp_align_free): New functions.
(FLOAT_BLOCK_SIZE): Redefine in terms of BLOCK_BYTES.
(struct float_block): Reorder and add gcmarkbits.
(GETMARKBIT, SETMARKBIT, UNSETMARKBIT, FLOAT_BLOCK, FLOAT_INDEX)
(FLOAT_MARKED_P, FLOAT_MARK, FLOAT_UNMARK): New macros.
(init_float, make_float): Use lisp_align_malloc.
(free_float, live_float_p): Don't use `type' any more.
(make_float): Use FLOAT_UNMARK to access to mark bit.
(mark_maybe_object, mark_maybe_pointer, survives_gc_p):
Use FLOAT_MARKED_P to access the mark bit.
(pure_alloc): Simplify use of ALIGN.
(mark_object): Use FLOAT_MARK to access the mark bit.
(gc_sweep): Use new macros to access the float's mark bit.
(init_alloc_once): Init free_ablock.
(GC_STRING_BYTES): Don't mask markbit (it's only used on `size').
(allocate_buffer): Move.
(string_bytes): Don't mask markbit of `size_byte'.
(mark_maybe_object, mark_maybe_pointer, Fgarbage_collect)
(mark_object, mark_buffer, survives_gc_p, gc_sweep):
Use the `size' field of buffers (rather than the `name' field) for
the mark bit, as is done for all other vectorlike objects.
Use the new macros to access the mark bit of vectorlike objects.
(display_buffer_1): Don't raise the win from which minibuf was entered.
(temp_output_buffer_show): Don't assume BEG == 1. Simplify.
(Fminibuffer_selected_window): Simplify.
(delete_window): Update for new types.
Initialize the new field `gcmarkbit'.
(mark_interval, MARK_INTERVAL_TREE): Use the new `gcmarkbit' field.
(mark_interval_tree): Don't mark the tree separately from the nodes.
(UNMARK_BALANCE_INTERVALS): Don't unmark the tree.
(mark_maybe_object, mark_maybe_pointer, Fgarbage_collect, mark_object)
(survives_gc_p, gc_sweep): Use new `gcmarkbit' fields.
(Qforeign_selection): New variable.
(syms_of_xselect): Intern and static it.
(selection_data_to_lisp_data): Return a unibyte string made from
data with `foreign-selection' text property.
Adjust phys_cursor.x to be relative to window box, rather than
text area before checking -- to ensure cursor is redrawn when
exposing window.
Note: This also fixes a similar (older) bug if display margins
are present.
