WAMultiPartEmailMessageTest sends non-portable message

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WAMultiPartEmailMessageTest>>#testFromToSubjectBody and 
WAMultiPartEmailMessageTest>>#testHeaders both send #withSqueakLineEndings.

String>>#withSqueakLineEndings is both non-portable and non-intention-revealing 
(at least in the context of Seaside).

I would propose adding String>>#withHtmlLineEndings. The method name 
immediately identifies it's purpose. A portable implementation could be added 
to Grease-Core:

  withHtmlLineEndings
    (self includes: Character lf) ifFalse: [ ^ self ].  "No Lf's ; nothing to do"
    (self includes: Character cr) ifFalse: [ ^ self copyReplacingAll: (String with: Character lf) with: (String with: Character cr) ].  "Only Lf's; change them to Cr's"
    ^ (self copyReplaceAll: (String with: Character cr with: Character lf) with: (String with: Character cr)) copyReplaceAll: (String with: Character lf) with: (String with: Character cr)

or a platform-specific implementation could be added to Grease-Pharo-Core:

  withHtmlLineEndings
    ^ self withSqueakLineEndings

I would prefer the platform-specific implementation because a) it is simpler 
and b) String>>#withHtmlLineEndings is useful outside the realm of Seaside (at 
least in VA Smalltalk).

Original issue reported on code.google.com by wemb...@instantiations.com on 9 Jul 2014 at 11:23