Fix T79822: Custom preset casing not preserved

When adding a new preset the name would be converted to lower case and
then displayed in the interface in title case. This was confusing
because the name didn't reflect what was typed, and there are many cases
when the name shouldn't be forced into title case (like 8K UHDTV for
example).

This commit leaves the custom preset names in the original casing, and
removes the conversion of filenames to title case for preset lists.

Differential Revision: https://developer.blender.org/D10224

release/scripts/modules/bpy/path.py

@@ -201,12 +201,13 @@ _display_name_literals = {
 }
 
 
-def display_name(name, *, has_ext=True):
+def display_name(name, *, has_ext=True, title_case=True):
     """
     Creates a display string from name to be used menus and the user interface.
-    Capitalize the first letter in all lowercase names,
-    mixed case names are kept as is. Intended for use with
-    filenames and module names.
+    Intended for use with filenames and module names.
+
+    :arg has_ext: Remove file extension from name
+    :arg title_case: Convert lowercase names to title case
     """
 
     if has_ext:
@@ -220,7 +221,7 @@ def display_name(name, *, has_ext=True):
     # (when paths can't start with numbers for eg).
     name = name.replace("_", " ").lstrip(" ")
 
-    if name.islower():
+    if title_case and name.islower():
         name = name.lower().title()
 
     name = _clean_utf8(name)