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May I suggest you to give a look to the Code::Blocks IDE for C++ ( http://www.codeblocks.org )?
It is written in C++ with wxWidgets; it is a very modular IDE (functionalities are provided by plugins); its editing component is based on Scintilla (and thus it can already highlight LaTeX files). And of ...

If I'm not wrong, the feature you are asking is called hard wrap. In contrast, soft wrap is the TeXnicCenter mode, where text is wrapped without newline characters being inserted.

I have a suggestion concerning soft wrap (the way I mean it). I suggest to preserve indentation when a line is wrapped ...