[Bug] S-flag imposes non-greedy match where it shouldn't

[Sebastian Gniazdowski <sgniazdowski@xxxxxxxxx>]

Hi,
str="aXXXXXbXXXXc"; print ${(S)str##X##}
Output: abXXXXc

As it can be seen, the flag worked correctly. However, when %% will be
used instead of ##:

str="aXXXXXbXXXXc"; print ${(S)str%%X##}
Output: aXXXXXbXXXc

Then the (S) flag seems to impose also non-greedy matching, not only
substring searching.
-- 
Sebastian Gniazdowski
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