Don't move window with swallowing

[danielwerg]

┌─anything───────────────────┐  ┌─kitty───────────────┐
│                            │  │ >                   │
│                            │  │          S1         │
│                            │  │                     │
│                            │  │                     │
│                            │  └─────────────────────┘
│             M              │                         
│                            │  ┌─anything────────────┐
│                            │  │ >                   │
│                            │  │                     │
│                            │  │         S2          │
│                            │  │                     │
│                            │  │                     │
└────────────────────────────┘  └─────────────────────┘

1. mpv video.mkv in S1
2. S1 swaps with S2 because mpv spawns at the bottom of the stack

Is it possible to make window preserve its original position after swallow?

hl.config({
  general = {
    layout = "master",
  },
  misc = {
    enable_swallow = true,
    swallow_regex = "^kitty$",
    swallow_exception_regex = "^wev$",
  },
})

[danielwerg]

somewhat related: #15172

[danielwerg]

@vaxerski

[vaxerski]

#15670