help: Don't delete buffer in the middle of debugging.
help: Don't delete buffer in the middle of debugging.

This fixes Nyxt hanging when invoking interactive restart. THe reason
was that there were two actions happening at the same time and thread
-- prompting for interactive restart and buffer deletion.

Interactive restarts don't yet work perfectly, though -- they open the
prompt twice somewhy. Without SLIME/SLY (that gets disabled by native
debugger) it's hard to trace the reason, but there should be some.

jmercouris/NeXT,jmercouris/NeXT