[wellylug] Staircase effect in vim...

[Enkidu]

My Linux machine runs Debian, and I ssh into it using putty. When I
cut and paste from Windows into a vim session in insert mode, I get an
interesting staircase effect where each successive line has an extra
tab added to it. By the end of a thousands lines or so, each line is
preceded by a thousand tabs! 

This turned a 26Kb file into a 1.2MB monster.

Does anyone know why this happens and how to stop it?

Cheers,

Cliff