anvil crashes when the tty is left and reentered

[PatrickHechler]

when anvil is started with --tty-udev and the left and then entered again anvil crashes.
after leaving the tty the anvil process stays alive, until the anvil tty is entered again.

anvil prints a lot of

2025-08-03T11:27:09.702016Z  WARN anvil::udev: Error during rendering: TemporaryFailure(
    DeviceInactive,
)

and ends with (the backtrace is only shown when RUST_BACKTRACE is set to 1)

2025-08-03T11:30:51.160231Z  WARN anvil::udev: Error during rendering: ContextLost(
    Access(
        AccessError {
            errmsg: "Failed to page flip",
            dev: Some(
                "/dev/dri/card0",
            ),
            source: Os {
                code: 22,
                kind: InvalidInput,
                message: "Invalid argument",
            },
        },
    ),
)

thread 'main' panicked at anvil/src/udev.rs:1494:30:
Rendering loop lost: DRM access error: Failed to page flip on device `Some("/dev/dri/card0")` (Invalid argument (os error 22))
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: anvil::udev::<impl anvil::state::AnvilState<anvil::udev::UdevData>>::render_surface
             at ./src/udev.rs:1494:30
   3: anvil::udev::<impl anvil::state::AnvilState<anvil::udev::UdevData>>::render
             at ./src/udev.rs:1375:17
   4: anvil::udev::run_udev::{{closure}}::{{closure}}
             at ./src/udev.rs:360:50
   5: calloop::loop_logic::LoopHandle<Data>::insert_idle::{{closure}}
             at /home/pat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/calloop-0.14.3/src/loop_logic.rs:164:17
   6: <core::option::Option<F> as calloop::sources::IdleDispatcher<Data>>::dispatch
             at /home/pat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/calloop-0.14.3/src/sources/mod.rs:597:13
   7: calloop::loop_logic::EventLoop<Data>::dispatch_idles
             at /home/pat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/calloop-0.14.3/src/loop_logic.rs:615:13
   8: calloop::loop_logic::EventLoop<Data>::dispatch
             at /home/pat/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/calloop-0.14.3/src/loop_logic.rs:633:9
   9: anvil::udev::run_udev
             at ./src/udev.rs:527:22
  10: anvil::main
             at ./src/main.rs:47:13
  11: core::ops::function::FnOnce::call_once
             at /usr/src/debug/rust/rustc-1.88.0-src/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.