Weird insertion from Vim on mouse click

Question

I'm using putty (on windows 7) to connect to shell and Vim as editor. I also have mouse=a option enabled in Vim, but I get some strange behavior (such as random insertions of characters and/or linebreaks) when I click to the right side of the Vim window (let's say it's like 70%+ of the screen width area where it gets weird). I'm slowly getting used to such behavior, but I'd really like to know if I could somehow fix this.

Answer 1

So it seems "the original xterm mouse protocol as implemented by PuTTY only supports mouse coordinates up to 223" ak2 told me on superuser. So for anyone who will face such problem - set PuTTY window size to 95 columns - and mouse will work just as expected everywhere.