constructed inventory does not use group variables from previous inve…

…ntory ansible#37397

* Add support for loading invenotry group variables in constructed plugin

lib/ansible/plugins/inventory/constructed.py

@@ -56,6 +56,7 @@
 
 from ansible import constants as C
 from ansible.errors import AnsibleParserError
+from ansible.inventory.helpers import get_group_vars
 from ansible.plugins.cache import FactCache
 from ansible.plugins.inventory import BaseInventoryPlugin, Constructable
 from ansible.module_utils._text import to_native
@@ -98,15 +99,15 @@ def parse(self, inventory, loader, path, cache=False):
             for host in inventory.hosts:
 
                 # get available variables to templar
-                hostvars = inventory.hosts[host].get_vars()
+                hostvars = combine_vars(get_group_vars(inventory.hosts[host].get_groups()), inventory.hosts[host].get_vars())
                 if host in fact_cache:  # adds facts if cache is active
                     hostvars = combine_vars(hostvars, fact_cache[host])
 
                 # create composite vars
                 self._set_composite_vars(self.get_option('compose'), hostvars, host, strict=strict)
 
                 # refetch host vars in case new ones have been created above
-                hostvars = inventory.hosts[host].get_vars()
+                hostvars = combine_vars(get_group_vars(inventory.hosts[host].get_groups()), inventory.hosts[host].get_vars())
                 if host in self._cache:  # adds facts if cache is active
                     hostvars = combine_vars(hostvars, self._cache[host])