Fixed #10057 -- Ensured that the 'show_delete' context variable in the admin's change view actually controls the display of the delete button. Thanks to rajeesh for the report, to patcoll for the patch, and to David Gouldin for the test.

tests/regressiontests/admin_views/admin.py

@@ -27,7 +27,7 @@ from .models import (Article, Chapter, Account, Media, Child, Parent, Picture,
     Album, Question, Answer, ComplexSortedPerson, PrePopulatedPostLargeSlug,
     AdminOrderedField, AdminOrderedModelMethod, AdminOrderedAdminMethod,
     AdminOrderedCallable, Report, Color2, UnorderedObject, MainPrepopulated,
-    RelatedPrepopulated)
+    RelatedPrepopulated, UndeletableObject)
 
 
 def callable_year(dt_value):
@@ -569,6 +569,11 @@ class UnorderedObjectAdmin(admin.ModelAdmin):
     list_per_page = 2
 
 
+class UndeletableObjectAdmin(admin.ModelAdmin):
+    def change_view(self, *args, **kwargs):
+        kwargs['extra_context'] = {'show_delete': False}
+        return super(UndeletableObjectAdmin, self).change_view(*args, **kwargs)
+
 
 site = admin.AdminSite(name="admin")
 site.register(Article, ArticleAdmin)
@@ -616,6 +621,7 @@ site.register(OtherStory, OtherStoryAdmin)
 site.register(Report, ReportAdmin)
 site.register(MainPrepopulated, MainPrepopulatedAdmin)
 site.register(UnorderedObject, UnorderedObjectAdmin)
+site.register(UndeletableObject, UndeletableObjectAdmin)
 
 # We intentionally register Promo and ChapterXtra1 but not Chapter nor ChapterXtra2.
 # That way we cover all four cases: