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Christopher Linnett
bc76665c65
A colour variable's value in a mode can now be {"alpha": {"variable", "opacity"}} - that
variable's colour with its alpha replaced - or {"mix": {"from", "to", "t"}}, a per-channel blend
of two colour variables or literals over the stored values (in the document's colour profile),
alpha included. Calculations resolve lazily like aliases, so bound layers, mode switches,
instances and undo follow their sources; they compose, and a loop, or a calculation that reads
more than 32 variables in its collection's modes (other collections in their default modes), is
refused when it is set. Operands are stored by id and read by exact id, as stored references
are. Files keep them; REST, CSS, Penpot and .fig exports write the colour they show in each mode;
deleting a source leaves its readers on the colour they showed; library import and swap
re-point their operands. The Variables panel shows them with their formula and can swap one for
an alias or detach it to its colour.