Only reorder bubbles if the position is different

This was be run needlessly during an insets change event while
bubbles were being collapsed, this causes a jump in the animation.

To fix, let's skip the reorder if it's not necessary.

Additionally, the reorder code path would trigger updating the bubble
positions -- this is needed after an orientation change, and was
happening after the overflow was reordered as a side effect. Now
that we're skipping needless reorders, this doesn't happen so a call
is added to explicitly update the positions of the bubbles after
the orientation change to fix it.

Bug: 318704215
Test: manual - have a bubble that hides the nav bar when its opened
             - move the bubble to a non-default location
             - expand and collapse the bubble
             => observe when collapsing the animation looks fine
             - have multiple bubbles, expand them, rotate the device
             => observe that the positions are correct
Change-Id: I6c2d83d54d05260bc221c5d24622cdaaa1f7f467