if we're already in the minibuffer, just assume a "no" response, it's the easiest (and safest) thing to do.

this way, :t kill-telescope RET jumsp to the definition of the command instead of the C-x C-c entry, for instance.

bad things (tm) can happen if we do a IMSG_GET hwen a page is loading. This fixes it by generating a new id for every request, so the current one (if there is one) can safely finish (stop_tab can take a while) while we're doing the next one.

if there are more tabs than space, the selected tab is no more always the first.