Amended fix for django-commons#1682 -- added warning in nav_subtitle

debug_toolbar/panels/templates/panel.py

@@ -130,9 +130,23 @@ def title(self):
 
     @property
     def nav_subtitle(self):
+        subtitle_parts = []
         if self.templates:
-            return self.templates[0]["template"].name
-        return ""
+            template_name = self.templates[0]["template"].name or "No template name"
+            subtitle_parts.append(template_name)
+        if self.invalid_file_form_configs_count:
+            # Add warning for user indicating file form configuration issue
+            issue_text = (
+                "issue" if self.invalid_file_form_configs_count == 1 else "issues"
+            )
+            subtitle_parts.append(
+                f"{self.invalid_file_form_configs_count} file form configuration "
+                f"{issue_text} found"
+            )
+        if len(subtitle_parts) > 1:
+            return " - ".join(subtitle_parts)
+        else:
+            return subtitle_parts[0] if subtitle_parts else ""
 
     template = "debug_toolbar/panels/templates.html"
 
@@ -260,6 +274,7 @@ def generate_stats(self, request, response):
         invalid_file_form_configs = self.check_invalid_file_form_configuration(
             html_content
         )
+        self.invalid_file_form_configs_count = len(invalid_file_form_configs)
 
         self.record_stats(
             {

tests/panels/test_template.py

@@ -81,6 +81,7 @@ def test_file_form_without_enctype_multipart_form_data(self):
             'but missing enctype="multipart/form-data".'
         )
         self.assertEqual(result[0]["error_message"], expected_error)
+        self.assertEqual(len(result), 1)
 
     def test_file_form_with_enctype_multipart_form_data(self):
         test_form = """<form id="test-form" enctype="multipart/form-data">
@@ -90,6 +91,21 @@ def test_file_form_with_enctype_multipart_form_data(self):
 
         self.assertEqual(len(result), 0)
 
+    def test_file_form_configuration_warning_display(self):
+        """
+        Test that the panel (does not) display[s] a warning when there are (no)
+        forms with file input types but encoding not set to multipart/form-data.
+        """
+        # Should not show issue in subtitle when no invalid configurations
+        self.panel.invalid_file_form_configs_count = 0
+        nav_subtitle = self.panel.nav_subtitle
+        self.assertNotIn("file form configuration issue", nav_subtitle)
+
+        # Should show issue in subtitle when invalid configurations
+        self.panel.invalid_file_form_configs_count = 2
+        nav_subtitle = self.panel.nav_subtitle
+        self.assertIn("2 file form configuration issues found", nav_subtitle)
+
     def test_insert_content(self):
         """
         Test that the panel only inserts content after generate_stats and