Currently tracking an unsupported field type simply skips the field. As code
has been cleaned and natively support 2many fields we consider tracking should
be done only on supported fields. Otherwise people might wonder why tracking
does not work.
We now raise when the type is not supported, which is currently the case for
html fields. As they may contain lot of data it is better to think of a
specific tracking based on history / diff than logging old / new value.
When the field does not exist on model, instead of returning None we now
raise. Indeed return value was not consistent and 'None' is not something
people expect as tracking values. If the field does not exist tracking should
clearly say it, as it indicates a model issue somewhere.
Task-3345979 (Mail: Simplify tracking model)
Part-of: odoo/odoo#124182
Thibault Delavallée
eea8e584fc