bug#78329: bash extraction of segment from end of string returns full string

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GNU bash, version 5.2.32(1)-release (x86_64-redhat-linux-gnu)

Copyright (C) 2022 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later < http://gnu.org/licenses/gpl.ht=
ml >

In Fedora 41.

${parameter:-offset} and ${parameter:-offset:length} return full parameter.

carl@fedora:~$ a=3D12345

carl@fedora:~$ echo ${a:-2}

12345

carl@fedora:~$ echo ${a:-3:2}

12345
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<div>GNU bash, version 5.2.32(1)-release (x86_64-redhat-linux-gnu)<br></div=
><div>Copyright (C) 2022 Free Software Foundation, Inc.<br></div><div>Licen=
se GPLv3+: GNU GPL version 3 or later &lt;<a href=3D"http://gnu.org/license=
s/gpl.html">http://gnu.org/licenses/gpl.html</a>&gt;<br></div><div><br></di=
v><div>In Fedora 41.<br></div><div><br></div><div>${parameter:-offset} and =
${parameter:-offset:length} return full parameter.<br></div><div><br></div>=
<div>carl@fedora:~$ a=3D12345<br></div><div>carl@fedora:~$ echo ${a:-2}<br>=
</div><div>12345<br></div><div>carl@fedora:~$ echo ${a:-3:2}<br></div><div>=
12345<br></div><div><br></div><div><br></div><div><div data-atmail-signatur=
e=3D"" class=3D"gmail_signature" data-smartmail=3D"gmail_signature" style=
=3D"display: block !important"><br></div></div><div><br></div>
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