I found that 50% of the time, NeoChat won't restore the last space but
instead get stuck at Home. Even worse, it will overwrite Home's last
opened room with the one from the space - resulting in really buggy
behavior.
The reason why this happens is partly due to the space hierarchy cache
(I think) but that's not the real problem in my opinion. During
setCurrentSpace, we needlessly update the last space & room config
despite us being the ones already reading it.
In addition to that I also refactored this code a bit to be more
consolidated and readable.
(cherry picked from commit 4c37dcf518)
b6a4b67c22