desktop-save-mode and multiple frames

[jojojames]

desktop-save-mode works with one frame using dired but supporting multiple frames is trickier due to frames being restored after buffers are restored.

This has some good information on workarounds. https://github.com/Alexander-Miller/treemacs/issues/101

Maybe this can be ported over. https://github.com/Alexander-Miller/treemacs/blob/master/treemacs-persist.el