[EXPAND] Nested parameter expansion results in an empty string when quoted

[Todor Vlaev <t.vlaev@xxxxxxxxx>]

Hi,

While playing around with parameter expansion I noticed that the
following didn't work in dash  (dash 0.5.5.1-7.4ubuntu1) as compared
to bash even though I believe it should be POSIX-compliant:

my_str=swan; last_char="${my_str#${my_str%?}}"; echo ${last_char}

If the double quotes are removed, the last character is printed correctly.

At a quick glance through the commits after the 0.5.5.1 release I saw
the following bug fix. Could it be related?

0d7d66039b614b642c775432fd64aa8c11f9a64d
[EXPAND] Fix quoted pattern patch breakage

Thanks,
Todor
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