Template panel context cleanup.

All panels get a copy of the template context when created and use an updated
copy when rendering so they can have full access to context vars and avoid
making changes to the shared context.

Signed-off-by: Rob Hudson <rob@cogit8.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/debug_toolbar/panels/headers.py b/debug_toolbar/panels/headers.py
index 7a44c2d..1e929f6 100644
--- a/debug_toolbar/panels/headers.py
+++ b/debug_toolbar/panels/headers.py
@@ -47,7 +47,8 @@ class HeaderDebugPanel(DebugPanel):
         )
 
     def content(self):
-        context = {
+        context = self.context.copy()
+        context.update({
             'headers': self.headers
-        }
+        })
         return render_to_string('debug_toolbar/panels/headers.html', context)