Bug: Switching in and out of Zen mode introduces cutoffs and doesn't resize process window

[IroncladDev]

After updating to the latest version, I'm starting to experience this issue.

You can see me reproducing the bug here:
https://github.com/user-attachments/assets/37d4d8d9-1c2c-4e6d-9e9b-7fd349052fac

And to show that this isn't neovim-specific:
https://github.com/user-attachments/assets/9213a817-5ce7-49d9-b5b4-62962a810e9f

To reproduce:

1. Open your terminal emulator in fullscreen
2. Run a few processes (preferably some sort of TUI)
3. Select a process in the sidebar and press 'z' to enter Zen mode
4. The process doesn't resize and instead shows a ton of question marks
5. Resize the terminal emulator window while still in zen mode
6. Fixes itself
7. Get out of zen mode with CTRL+A
8. Process does not resize (if using a TUI you'll see a cutoff)
9. Resize the terminal emulator window
10. Process resizes

Neovim in Mprocs in Alacritty on MacOS, btw

[pvolok]

Thank you for such a thorough explanation!