I have only talked to my other T about it. Last year (2015) it was very bad. I had a lot of thoughts about it, every day several times. Also lots of urges. I've told my T about it, but we haven't really talked about it. She didn't really asked questions about it, she focused more on why I was feeling so bad and such. I got the feeling she didn't really want to talk about those thoughts (not just from one time). She never asked about it herself. And I didn't brought it up again, while I did felt the need to talk about it.
Maybe she's still too young and unexperienced with clients with SI thoughts?

Current T has asked me about it, but I haven't have those thoughts/urges that often anymore (just the wish to be dead, but not really active thoughts about it).

Previous T's has also not asked me about it. I've only been asked about it in those intake-forms.