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Hanif Koh
904b837799
A child preset stores "nil" both for an override the user switched off and for a per-variant column it inherits from its parent, and the loader filled every nil from the parent. Whenever the parent preset sets Retract Before Wipe or another override, switching it off lasted only until the next restart, project open or newer cloud copy. Treat the keys in is_filament_extruder_override_key, now including the ironing overrides, as "nil means off": Preset::save and the project-embedded preset diff write such an option with all its columns, and the loader keeps its nil columns while still mapping them onto the parent's variants by name. Every other nullable option keeps nil as "inherit this column". The cloud diff only force-emits a disabled override whose default is a real value.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: