Since Widget and MWidget inherit from HasTraits, and MDataWidget is first in the MRO, we get HasStrictTraits second, which messes with super() calls to MWidget as HasStrictTraits doesn't have the right methods.
Fixes are either to consistently use HasTraits or HasStrictTraits, but HasStrictTraits is not backwards compatible, so we should drop use of that for now.
corranwebster
commented
2 years ago
Since
WidgetandMWidgetinherit fromHasTraits, andMDataWidgetis first in the MRO, we getHasStrictTraitssecond, which messes withsuper()calls toMWidgetasHasStrictTraitsdoesn't have the right methods.Fixes are either to consistently use
HasTraitsorHasStrictTraits, butHasStrictTraitsis not backwards compatible, so we should drop use of that for now.