It is generally agreed that posted code is best formatted so that the horizontal scroll is not required for the code box in most cases and for most users.
I have conducted surveys here and on Meta Mathematica and found that the common length varies between sites due to the different designs uses but that most users see the same code box width. I have also learned that those of us using non-default zooms may have very different, often greater, code box widths.
I am requesting a feature that indicates when code is wider than an ideal width (as defined by the majority of viewers). This should be a visual indicator such as a vertical line in the edit preview area, rather than a pop-up or other annoyance in the editing area itself.
The line would be present only for those with wider-than-normal code boxes.* For users with the "common" code box width the code box preview already serves this purpose.
It would be useful to me to have this functionality personally if someone is able and willing to provide a userscript, but I feel that this feature has general application and benefit as it would inform those who are unaware of the common line length and subtly remind those who are in the habit of ignoring it.
Since the common code box width varies by site design it would be necessary to have his configurable by site, perhaps by the moderators.
I am tagging this with discussion because if anyone has a better idea about how to accomplish what I describe two paragraphs above I'd like to hear it.
* It could also appear for those with narrow than normal code boxes when long lines exist and would serve to provide these users as well with a guide for what the common width is on a platform that otherwise provides no indication.
