The `ENUM_OPERATORS` utility was used in `PropertyFlag` in d154ebfa83.
In that commit, it was set with a maximum value lower than
`PROP_TEXTEDIT_UPDATE`.
Consequently, when `bpy_props.c` was converted to C++ in 6fcecb7e46,
the cast to `PropertyFlag` caused the value of `PROP_TEXTEDIT_UPDATE`
to be cleared.
The solution is to set the maximum value to `PROP_TEXTEDIT_UPDATE`
instead of `PROP_NO_DEG_UPDATE`.
22206a1592