Rename 'editing' query param to 'is_editing'

wagtail/admin/tests/test_editing_sessions.py

@@ -156,7 +156,7 @@ class TestPingView(WagtailTestUtils, TestCase):
                 "wagtailadmin_editing_sessions:ping",
                 args=("wagtailcore", "page", self.page.id, self.session.id),
             ),
-            {"editing": "1"},
+            {"is_editing": "1"},
         )
         self.assertEqual(response.status_code, 200)
         response_json = response.json()
@@ -318,7 +318,7 @@ class TestPingView(WagtailTestUtils, TestCase):
                 "wagtailadmin_editing_sessions:ping",
                 args=("wagtailcore", "page", self.page.id, 999999),
             ),
-            {"editing": "1"},
+            {"is_editing": "1"},
         )
         self.assertEqual(response.status_code, 200)
         response_json = response.json()

wagtail/admin/views/editing_sessions.py

@@ -52,7 +52,7 @@ def ping(request, app_label, model_name, object_id, session_id):
         )
 
     session.last_seen_at = timezone.now()
-    session.is_editing = request.GET.get("editing", False)
+    session.is_editing = request.GET.get("is_editing", False)
     session.save()
 
     other_sessions = (