fromHook property
Whether a render hook of contributor gave the fragment, one of
RoleOutput.fragments or a fragment variable of RoleOutput.vars,
which the hook wrote from the data of its role.
The other fragments are those of the contributions of contributor:
a fragment for a socket, and the code of a variable of a brick that
depends on a role (see RoleVar). They are the same whatever the
modules of the app give the roles.
Implementation
final bool fromHook;