IMO, a useful behavior for a text file editor is to:

* On open, detect the line end convention of the file and remember it. 
This is not too hard to do as long as the file is in fact a text file 
(if it's a binary file you shouldn't be using a text editor on it).

* On save, save in the same line end convention that the file previously 
had.

* On "save as" provide the opportunity to change the line end convention 
as well as the file name.

* New files should default to the platform's line end convention, but 
again be overridable on save.

Regards,

-Martin

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