[goerz]

No, all source code lines should be max 80 columns wide, always. That way, you can put a well-defined number of editor panes next to each other on the screen (3 columns on a 16:9, 2 columns on a 4:3). You're also able to print out snippets of source code on paper at 10pt font size.

[rhn_mk1]

...or 1.5 panes on a different 16:9, or 0.7 panes on a phone screen.

80 character limit sounds like it makes sense for order, but depending on size & eyesight, a lot of the screen may end up wasted.

    Personally, I hate nothing more than seeing lines wrapped like
    this when reading
    emails wrapped to 80 characters per line. This wastes vertical
    space, making the
    problem even worse.