* Reject 3MF Plate IDs Below 1 Instead of Indexing Before the Plate List
The plate importer copied each plater_id from model_settings.config into the
1-based plate list after checking only the upper bound, so plater_id="0"
wrote to plate_data_list[-1] and crashed on load. Both copy sites now reject
ids below 1 with the same "invalid plate index" error already used for ids
past the end.
* Drop Malformed 3MF Paint Data Instead of Reading Past the Bitstream
Painted facets are decoded from a bitstream a nibble at a time with no bound
check, so a truncated or corrupt paint string in a 3MF (for example split
codes with no children behind them) read past the end and crashed on load and
slice. A one- or two-side split naming side 3 also indexed past the triangle's
vertices.
Every nibble read now goes through a bounds-checked reader. Loading validates
each triangle's tree and drops a malformed one with a warning, so the stored
data, used extruder states and later decoding all agree. deserialize() also
unwinds and clears any triangle whose tree is incomplete or malformed, and
has_facets() stops at a truncated triangle. Valid streams decode unchanged.
HanifKoh