[PR #10566/14f706c5 backport][stable-9] merge_variables lookup: avoid deprecated Templar.set_temporary_context (#10567)

merge_variables lookup: avoid deprecated Templar.set_temporary_context (#10566)

Avoid deprecated Templar.set_temporary_context.

(cherry picked from commit 14f706c)

Co-authored-by: Felix Fontein <[email protected]>

Author: patchback[bot]

changelogs/fragments/10566-merge_variables.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "merge_variables lookup plugin - avoid deprecated functionality from ansible-core 2.19 (https://github.com/ansible-collections/community.general/pull/10566)."

plugins/lookup/merge_variables.py

@@ -197,8 +197,8 @@ def _merge_vars(self, search_pattern, initial_value, variables):
             result = initial_value
 
         for var_name in var_merge_names:
-            with self._templar.set_temporary_context(available_variables=variables):  # tmp. switch renderer to context of current variables
-                var_value = self._templar.template(variables[var_name])  # Render jinja2 templates
+            temp_templar = self._templar.copy_with_new_env(available_variables=variables)  # tmp. switch renderer to context of current variables
+            var_value = temp_templar.template(variables[var_name])  # Render jinja2 templates
             var_type = _verify_and_get_type(var_value)
 
             if prev_var_type is None: