Prevent yas-new-snippet inserting region twice #1102
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On yas-new-snippet, if yas-wrap-around-region is t and
yas-new-snippet-default has its default value, the selected region is
inserted twice: Once for yas-selected-text and once for $0.
The yas-new-snippet-default snippet is a special usage scenario, where
values of yas-wrap-around-region other than nil don't make much sense,
so override it.