[Django] #36049: The `upper` template filter should set `is_safe=True`

[Django]

#36049: The `upper` template filter should set `is_safe=True`
----------------------------+-----------------------------------------
     Reporter:  Lily Foote  |                     Type:  Uncategorized
       Status:  new         |                Component:  Uncategorized
      Version:  5.1         |                 Severity:  Normal
     Keywords:              |             Triage Stage:  Unreviewed
    Has patch:  0           |      Needs documentation:  0
  Needs tests:  0           |  Patch needs improvement:  0
Easy pickings:  0           |                    UI/UX:  0
----------------------------+-----------------------------------------
 I noticed this inconsistency between `upper` and `lower` where `upper` has
 `is_safe=False` but `lower` has `is_safe=True`. I think `lower` is correct
 and `upper` is incorrect.

 This has been the case ever since `is_safe` was introduced in
 
https://github.com/django/django/commit/356662cf74c99fac90afb0f5e6aac8d2d573e62a.

 {{{
 from django.template import engines
 from django.utils.safestring import mark_safe


 def test_is_safe():
     template = """
 {{ html|upper }}
 {{ html|lower }}
 """
     template = engines["django"].from_string(template)
     html = mark_safe("<p>Hello World!</p>")
     assert template.render({"html": html}) == """
 <p>HELLO WORLD!</p>
 <p>hello world!</p>
 """

 E       AssertionError: assert '\n&lt;P&gt;H... world!</p>\n' ==
 '\n<p>HELLO W... world!</p>\n'
 E
 E
 E         - <p>HELLO WORLD!</p>
 E         + &lt;P&gt;HELLO WORLD!&lt;/P&gt;
 E           <p>hello world!</p>
 }}}
-- 
Ticket URL: <https://code.djangoproject.com/ticket/36049>
Django <https://code.djangoproject.com/>
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