Comment 7 for bug 559372

Yes, there we have to expect the user doing the selection before, I found no way to detect if the text in clipboard comes from Putty or not.

Regarding the Ctrl+[: It depends on where you do the selection. If you do it inside insert/append mode, then we need to go
into normal mode first, before using 'gv'. And if you are already in normal mode, extra Ctrl+[ doesn't hurt.