A couple of issues with Show Peek at Definition.
a) I did Cmd+Shift+D when fabs was selected, and got an internal error
b) I did Cmd+Shift+D on a member with a long definition (the class method dmod) and got this popup where it was scrolled to the next line, so nothing was visible.
Selecting the popup and scrolling showed that the correct information was indeed there. I don’t think there should be an extra LF in this case.
