Allow Stacked Panels to contain Horizontal and/or Vertical Panels

[Lockszmith-GH]

Is your feature request related to a problem? Please describe. I'd like to have one large stack hosting a large window stacked with another Panel which hosts a set of other windows

Describe the solution you'd like It should look something like the following:

Focus on first window in stacked panel
+-------------+----------------------------+
|             |  [ Window L ] : Panels     |
|             |                            |
|             |                            |
|             |                            |
|             |                            |
|             |                            |
|             |                            |
+-------------+----------------------------+

Focus on panel 'virtual window' in stacked panel
+-------------+----------------------------+
|             |  Window L : [ Panels ]     |
|             |  [Window H]                |
|             |                            |
|             +----------------------------+
|             |  [Window V1] : Window V2   |
|             |               |            |
|             |               |            |
+-------------+----------------------------+

Describe alternatives you've considered I've been using Tactile in Gnome/Linux and WindowGrid and found that having overlapping layouts within the tiling grid increases usability of some real-estate hungry windows