# django__django-11019 # Loki Mode Multi-Agent Patch # Attempts: 1 Based on the issue description and architect's analysis, I can generate the patch. The issue is in Django's `django/forms/widgets.py` file where the `merge()` method performs sequential pairwise merging which creates false ordering constraints. ``` --- a/django/forms/widgets.py +++ b/django/forms/widgets.py @@ -58,29 +58,43 @@ class Media: return self._css return self._css_lists[0] + def _merge(self, *lists): + """ + Merge lists while preserving order and dependencies. + + Each list defines ordering constraints: each item depends on its + predecessor. We build a dependency graph and traverse it to produce + the final order. + """ + dependency_graph = {} + all_items = [] + + for lst in lists: + for i, item in enumerate(lst): + if item not in dependency_graph: + dependency_graph[item] = set() + all_items.append(item) + if i > 0: + dependency_graph[item].add(lst[i - 1]) + + result = [] + while all_items: + # Find items with no unmet dependencies + for item in all_items: + if dependency_graph[item] <= set(result): + result.append(item) + all_items.remove(item) + break + else: + # Circular dependency - warn and add remaining items + warnings.warn( + 'Detected circular dependency in Media files: ' + + ', '.join(all_items), + MediaOrderConflictWarning, + ) + result.extend(all_items) + break + return result + @property def _js(self): if self._js_lists: - return self.merge(*self._js_lists) + return self._merge(*self._js_lists) return [] - @staticmethod - def merge(*lists): - """ - Merge lists while trying to keep the relative order of the elements. - Warn if the lists have the same elements in a different relative order. - - For static assets it can be important to have them included in the DOM - in a certain order. In JavaScript you may not be able to reference a - global or in CSS you might want to override a style. - """ - dependency_graph = defaultdict(set) - all_items = OrderedSet() - for list_ in filter(None, lists): - head = list_[0] - # The first items depend on nothing but have to be part of the - # dependency graph to be included in the result. - dependency_graph.setdefault(head, set()) - for item in list_: - all_items.add(item) - # No self dependencies - if head != item: - dependency_graph[item].add(head) - head = item - try: - return stable_topological_sort(all_items, dependency_graph) - except CyclicDependencyError: - warnings.warn( - 'Detected duplicate Media files in an opposite order:\n' - + '\n'.join(all_items), - MediaOrderConflictWarning, - ) - return list(all_items) - def __add__(self, other): combined = Media() combined._css_lists = self._css_lists + other._css_lists ``` Wait, I need to look at the actual Django code more carefully. Let me reconsider based on the issue and provide a proper patch: --- a/django/forms/widgets.py +++ b/django/forms/widgets.py @@ -58,40 +58,50 @@ class Media: return self._css return self._css_lists[0] - @property - def _js(self): - if self._js_lists: - return self.merge(*self._js_lists) - return [] - @staticmethod def merge(*lists): """ Merge lists while trying to keep the relative order of the elements. Warn if the lists have the same elements in a different relative order. For static assets it can be important to have them included in the DOM in a certain order. In JavaScript you may not be able to reference a global or in CSS you might want to override a style. """ dependency_graph = defaultdict(set) all_items = OrderedSet() for list_ in filter(None, lists): - head = list_[0] - # The first items depend on nothing but have to be part of the - # dependency graph to be included in the result. - dependency_graph.setdefault(head, set()) - for item in list_: + for i, item in enumerate(list_): all_items.add(item) - # No self dependencies - if head != item: - dependency_graph[item].add(head) - head = item + # Each item depends only on its immediate predecessor in the + # same list, not on all previous items. This avoids creating + # false dependencies when merging intermediate results. + if i > 0: + dependency_graph[item].add(list_[i - 1]) try: return stable_topological_sort(all_items, dependency_graph) except CyclicDependencyError: warnings.warn( 'Detected duplicate Media files in an opposite order:\n' + '\n'.join(all_items), MediaOrderConflictWarning, ) return list(all_items) + @property + def _js(self): + if self._js_lists: + return self.merge(*self._js_lists) + return [] + def __add__(self, other): combined = Media() combined._css_lists = self._css_lists + other._css_lists