The terminal switcher uses ivy to select buffers from a list of
buffer *names*, however this can cause weird situations if, for
example, two `vterm` sessions are in the same folder and buffer name
uniquification is active.
This commit implements a corrected solution, which constructs an
association list of buffer names to their actual buffer object, and
retrieves the buffer object from that list after the user has made
their selection. This way, changes in buffer names during terminal
selection do not lead to confusing results.
Change-Id: I3ab3d6b715b32606cf771dabc31d9d4507c8b856
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9145
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
4b4ec86114