3fc7ed4088
Commit 932ccac1 changed Source to use a regular constructor instead of `_init()`. Unfortunately that results in ordering issues for subclasses that override `_createPolicy()`, if that method needs to access any properties that are set in the constructor (as `this` is only available after chaining up to the parent). We can fix that by simply setting the policy from the constructor, instead of relying on some overriden method being called. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3170>