Terminal Preview Hanging On Startup

### Windows Terminal version

1.23.10353.0

### Windows build number

22631.4890

### Other Software

_No response_

### Steps to reproduce

I don't know what is causing it. For me it happens right now any time I try to open the terminal in any way at all.

### Expected Behavior

The terminal opens and does not peg a CPU core.

### Actual Behavior

As of today, my Windows Terminal Preview build has started hanging on every startup, spinning the CPU. I also noticed similar behavior with Terminal Canary starting several months ago, so I had to switch to Preview which was working at the time... But now Preview also has the same behavior...


I am now debugging it with windbg, and it seems this thread has the highest usage:


If we let it run and randomly break now and then we see a similar stack trace every time with a call to TerminalApp!Pane::LayoutSizeNode::operator=




That leaves me to believe this is some kind of endless loop somewhere within this call trace.

I have `firstWindowPreference": "persistedWindowLayout"` enabled in my config. Here is redacted version of my `state.json` file:
```json
{
"dismissedMessages" :
[
"deprecated",
"closeOnExitInfo"
],
"generatedProfiles" :
[
"{REDACTED}",
"{REDACTED}",
"{REDACTED}",
"{REDACTED}"
],
"persistedWindowLayouts" :
[
{
"initialPosition" : "0,-14",
"initialSize" :
{
"height" : 880.4444580078125,
"width" : 1536
},
"launchMode" : "maximized",
"tabLayout" :
[
{
"action" : "newTab",
"commandline" : "REDACTED",
"profile" : "REDACTED",
"sessionId" : "{REDACTED}",
"startingDirectory" : "REDACTED",
"suppressApplicationTitle" : false,
"tabTitle" : "REDACTED"
},
{
"action" : "splitPane",
"commandline" : "REDACTED",
"profile" : "REDACTED",
"sessionId" : "{REDACTED}",
"size" : 0.5,
"split" : "right",
"splitMode" : "manual",
"startingDirectory" : "REDACTED",
"suppressApplicationTitle" : false,
"tabTitle" : "REDACTED"
},
{
"action" : "splitPane",
"commandline" : "REDACTED",
"profile" : "REDACTED",
"sessionId" : "{REDACTED}",
"size" : 0.5,
"split" : "down",
"splitMode" : "manual",
"startingDirectory" : "REDACTED",
"suppressApplicationTitle" : false,
"tabTitle" : "REDACTED"
},
{
"action" : "focusPane",
"id" : 0
},
"togglePaneZoom",
{
"action" : "newTab",
"commandline" : "REDACTED",
"profile" : "REDACTED",
"sessionId" : "{REDACTED}",
"startingDirectory" : "REDACTED",
"suppressApplicationTitle" : false,
"tabTitle" : "REDACTED"
},
{
"action" : "switchToTab",
"index" : 0
}
]
}
],
"recentCommands" :
[
"ls"
],
"settingsHash" : "REDACTED"
}
```

The report points to TerminalApp::Pane::LayoutSizeNode::operator= and a persistedWindowLayouts entry in state.json. Start by reproducing startup with firstWindowPreference set to persistedWindowLayout and inspecting the reported call trace. Done means Preview starts without pegging a CPU core for this configuration, with the regression verified appropriately.

Written by the indexing model from the issue text.