If I paste multiple lines into the Konversation input line, I get a warning. But if I paste a single super-long line which gets automatically split into multiple lines, there is no warning, even though the result is the same (multiple lines flooding the channel). Might be related to bug 128144.
Commented by GCI sudent: True, konversation (Version 1.6-master #5001) doesn't warn if you paste a long line. It can be a nice feature IMHO.
Comment by GCI student: I'm using the same version as you and I reproduced this bug. OS: Ubuntu 14.10 with KDE 4.14.2
Confirmed on konversation 1.7.7.