Move pdmToVariant/pdmFromVariant overloads for cvf::Color3f, Vec3d, Mat4d, and
Mat3d from namespace caf to namespace cvf. Templates in
cafInternalPdmFieldTypeSpecializations.h use "using caf::pdmToVariant" followed
by an unqualified call, so ADL searches the argument's namespace (cvf). With the
overloads only in caf, the default template was selected, causing cvf::Color3f to
be stored raw in a QVariant instead of as QColor — breaking color field editing
and producing QVariant::save warnings.
All call sites now use the unqualified "using caf::pdmXxx; pdmXxx(value)" pattern
so ADL finds the correct overload without depending on cvf:: as a visible prefix.
Add AdlVariantTest to cafPdmCoreColor3fTest.cpp that exercises this exact pattern.
Adds caf::toVariant<T> and caf::fromVariant<T> to cafPdmFieldTraits.h as
thin wrappers that encapsulate the ADL two-step internally. Client code can
now call caf::toVariant(x) directly instead of requiring a using-declaration
at every call site.
Introduce cafPdmFieldTraits.h with ADL-based pdmToVariant/pdmFromVariant/pdmVariantEqual
as a replacement for PdmValueFieldSpecialization. Migrate all types (AppEnum, FilePath,
PdmPointer, cvf types) and all call sites (PdmDataValueField, PdmProxyValueField, UI
framework, ApplicationLibCode). Delete cafInternalPdmValueFieldSpecializations.h.
Add cafPdmFieldTraits unit tests and fix std::optional support.
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Magne Sjaastad