Show a tab count for each space in a given window

[jakelauer]

It is easy to lose tabs if you have tabs open in more than one space in a given window, since you can only see one space at a time. It'd be great to have a way to show a counter for the number of tabs open in each space above their icon.

And just to be clear, I think it's important to point out that this would only be useful if the count is specific to each window rather than the total for all windows.