ATTDISP asks "Enter attribute visibility setting [Normal/ON/OFF]" (default:
the current setting) and sets ATTMODE to 1 / 2 / 0. The renderer now reads
ATTMODE: OFF hides every attribute, ON also draws invisible ones, Normal
draws the visible ones as before.
ATTSYNC ("Enter an option [?/Name/Select] <Select>") brings every reference
of a block, in model space, layouts and other block definitions, in line
with the block's attribute definitions: missing attributes are added with
their defaults, ones whose definition is gone are removed, values are kept
for tags still defined (any case), and position, height, style and
visibility come from the definition.
Both live in the new cmd/blocks/attribs.rs.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
