[bug] Size seemingly not being respected on macOS with different monitor scalings

[crutchcorn]

Describe the bug

When opening a new window with the following code:

  const appWindow = new WebviewWindow("settings", {
    title: "Settings",
    center: true,
    fullscreen: false,
    resizable: false,
    alwaysOnTop: true,
    focus: true,
    focusable: true,
    skipTaskbar: true,
    visible: true,
    url: "/settings",
  });

On a system with macOS 26.2, it often opens on a different monitor than the main window's current monitor.

Note: Due to different monitor sizes, I currently have my monitors set to different scaling resolutions.

When this happens, it seems to shrink the window size from its previous size due to the different scaling resolutions, leading to an ultimately humorous but unhelpful window size like so:

This persists even when explicitly sizing the window after creation:

  const appWindow = new WebviewWindow("settings", {
    title: "Settings",
    center: true,
    fullscreen: false,
    resizable: false,
    alwaysOnTop: true,
    focus: true,
    focusable: true,
    skipTaskbar: true,
    visible: true,
    url: "/settings",
  });

  void appWindow
    .once("tauri://created", function () {})
    .then(() => {
      appWindow.setSize(
        new LogicalSize({
          height: 640,
          width: 800,
        }),
      );
      appWindow.setPosition(
        new LogicalPosition({
          x: 0,
          y: 0,
        }),
      );
    })
    .catch((err) => console.error(err));

Reproduction

No response

Expected behavior

No response

Full tauri info output

> moonsound@0.1.0 tauri
> tauri info


[✔] Environment
    - OS: Mac OS 26.2.0 arm64 (X64)
    ✔ Xcode Command Line Tools: installed
    ✔ Xcode: 26.2
    ✔ rustc: 1.92.0 (ded5c06cf 2025-12-08)
    ✔ cargo: 1.92.0 (344c4567c 2025-10-21)
    ✔ rustup: 1.28.2 (e4f3ad6f8 2025-04-28)
    ✔ Rust toolchain: stable-aarch64-apple-darwin (default)
    - node: 24.12.0
    - pnpm: 10.23.0
    - yarn: 1.22.22
    - npm: 11.6.2
    - bun: 1.3.5
    - deno: deno 2.6.3

[-] Packages
    - tauri 🦀: 2.9.5
    - tauri-build 🦀: 2.5.3
    - wry 🦀: 0.53.5, (outdated, latest: 0.54.1)
    - tao 🦀: 0.34.5
    - @tauri-apps/api  ⱼₛ: 2.9.1
    - @tauri-apps/cli  ⱼₛ: 2.9.6

[-] Plugins
    - tauri-plugin-opener 🦀: 2.5.3
    - @tauri-apps/plugin-opener  ⱼₛ: 2.5.3
    - tauri-plugin-fs 🦀: 2.4.5
    - @tauri-apps/plugin-fs  ⱼₛ: not installed!
    - tauri-plugin-window-state 🦀: 2.4.1
    - @tauri-apps/plugin-window-state  ⱼₛ: not installed!
    - tauri-plugin-process 🦀: 2.3.1
    - @tauri-apps/plugin-process  ⱼₛ: 2.3.1
    - tauri-plugin-dialog 🦀: 2.5.0, (outdated, latest: 2.6.0)
    - @tauri-apps/plugin-dialog  ⱼₛ: 2.5.0 (outdated, latest: 2.6.0)
    - tauri-plugin-os 🦀: 2.3.2
    - @tauri-apps/plugin-os  ⱼₛ: 2.3.2

[-] App
    - build-type: bundle
    - CSP: unset
    - frontendDist: ../dist/moonsound/browser
    - devUrl: http://localhost:1420/
    - framework: Angular
    - bundler: Webpack

Stack trace

Additional context

No response