Field with Transformations is Sticky

[axbycc-mark]

Consider this snippet.

# -*- mode: snippet -*-
# name: example
# key: example
# --

${1:variable} ${2:$$(unless yas-modified-p (format "++%s" (yas-field-value 1)))}
$0       

The default expansion is variable ++variable. The intended usage is in defining a c-style loop snippet. Usually when you first enter into a tab stop, typing x will remove the placeholder and replace it with x. However, on the second tab stop in this snippet, typing x will leave you with variable ++variablex instead of the more consistent variable x.

Hence, making a field value with a transform makes it "sticky" and it doesn't behave like other fields.