While you can expect codeblocks to preserve the formatting of your code (unless you have codewrapping enabled, but additional line breaks are made explicit by adding a red '+' and not incrementing the line number), I just discovered that this is not the case with inlinecode. The browser can insert a line break wherever a space is present if the line is too long. Most of the time this is not a big issue since there's no difference between a space and a line break outside of string constructs, but I'd still like pieces of code that were meant to be a single line to be displayed on a single line (as a matter of fact, I discovered this on a regex with the /x modifier, so one of the cases where whitespace doesn't matter).
I added this line .inlinecode { white-space:nowrap; } in my CSS, so I don't have the problem anymore. But there might be other monks around who would like the oneliners to always be displayed on one line, and I think this change would make sense as default behaviour.
NB: if you want to try for yourself, here is a one liner that you can break into two lines by resizing your browser's window: perl -lne '(1x$_) !~ /^1?$|^(11+?)\1+$/ && print "$_ is prime"'
