[bug #35699] NSStrings can point into garbage memory (misuse of app-supplied backing buffer)

[Jens Alfke]

Follow-up Comment #1, bug #35699 (project gnustep):

I looked at GSString.m a bit.
It seems that substring_c and substring_u should check the parent string's
_flags.owned and create a GSSubString only if the flag is true; otherwise they
should be conservative and create a regular string with a copy of the
characters/bytes.

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