Mark not restored on compound floating window

[eater]

Describe the bug
I created a lovely floating + tiled window and I saved it using i3-resurrect. The mark on the outer frame is present in the json file (attached), but it is not restored when I restore the window.

To Reproduce
Steps to reproduce the behavior:

1. Create a floating window containing multiple tiles.
2. Mark its outermost parent, so that you can send it to the scratchpad.
3. i3-resurrect save -w __i3_scratch -p bunchawindows
4. Close float.
5. i3-resurrect restore -p bunchawindows

Expected behavior
The restored window should have the mark, but it doesn't.

System information (please complete the following information):

• Linux distribution: Ubuntu 18.04
• i3-resurrect version (output of i3-resurrect --version): 1.4.3
• i3 version (output of i3 -v): 4.19
• Python version (output of python -V): 3.6.9

[JonnyHaystack]

How are you even able to do i3-resurrect save -w __i3_scratch -p bunchawindows? According to #97 I would've expected this not to even save successfully.

[JonnyHaystack]

Can you send the saved layout.json? Does it contain all the marks that it's supposed to?

[eater]

Yeah, I attached the layout.json to the original issue. The mark is called "msgs".

[JonnyHaystack]

Oh sorry I must be blind, didn't reread properly before asking that.. Hmm I'm not sure there's anything that I can do if the mark is saved in the layout file but not being restored by i3 itself. That would probably need changing in i3 itself.