Retain terminal splits during window reload

[mke-xena]

I often have multiple Terminal splits going at the same time: One for a server, one for a client, one for general messing around, laid out side-by-side:

It works well for my purposes, but whenever I have to reload the window (e.g. loss of SSH to remote system when using the Remote features, or due to an extension updating) then my terminal layout is lost. I still have the Server, Client and General terminals, but they're no longer in a split view. And as far as I can tell there's no way to re-introduce the splits with the existing terminals.

My request: Maintain the splits during window reload.

[meganrogge]

@mke-xena this is a goal for our next iteration, so coming soon! /duplicate
Duplicate of #109244