Adds a new internal builder that makes it possible to override the
`emacsPackages` passed to our Emacs packages, which in turn makes it
possible to inject them into the emacsPackages fixpoint and use them
with features like Emacs native compilation.
Change-Id: I80dad57115c83cf5693ae6ba4e4cf3105d103d5e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3003
Tested-by: BuildkiteCI
Reviewed-by: adisbladis <adisbladis@gmail.com>
Reviewed-by: grfn <grfn@gws.fyi>
Since upgrading to Emacs 27 I have observed a strange behaviour where
this terminal switcher sometimes fails to select a valid buffer, in
which case it falls through to the case that just opens a new buffer
instead.
This is kind of annoying and to aid in debugging this change makes the
creation of new buffers explicit and fails if no matching buffer is
found.
Note that this is likely not a fix for the issue itself, but it will
help debug what is going on.
Change-Id: I906869aba7d25156aaf92c090b169ce02785b85e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1930
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
