[bug] Window Size and Fullscreen Issues with decoration: false

[floriskn]

Describe the bug

When using a Tauri application with decoration: false, several issues occur with window sizing, particularly in fullscreen mode:

1. Inner Window Size in Fullscreen:

   • When transitioning from a non-maximized window to fullscreen, the inner WRY webview is slightly smaller (by about one pixel).
   • These issues only appear when decoration: false; with decoration: true, the behavior is correct.

   
   
   

2. Unexpected Borders in Fullscreen:

   • A white or black border sometimes appears when in fullscreen mode.

   

3. Incorrect Window Size on Creation:

   • A window configured with dimensions 800x600 creates an outer window of 816x639 pixels.
   • The inner WRY webview further deviates to 814x637 pixels.

   
   

4. Fullscreen Issues After Maximization:

   • If the window is maximized before entering fullscreen, the window becomes even more misaligned, with a 40-pixel offset and overflowing content on the right side of the screen.

   
   
   

Reproduction

Steps to Reproduce

1. Create a Tauri window with the following configuration:

{
  "width": 800,
  "height": 600,
  "fullscreen": false,
  "decoration": false
}

2. Observe the created window dimensions.
3. Enter fullscreen mode from a non-maximized state, then exit fullscreen.
4. Maximize the window, then enter fullscreen again.
5. Observe borders and overflow behavior in both scenarios.

Expected behavior

• The window should match the specified size when created.
• Fullscreen mode should use the entire screen without leaving gaps or borders, regardless of the previous window state.

Full tauri info output

[✔] Environment
    - OS: Windows 10.0.19045 x86_64 (X64)
    ✔ WebView2: 131.0.2903.63
    ✔ MSVC: Visual Studio Community 2022
    ✔ rustc: 1.78.0 (9b00956e5 2024-04-29)
    ✔ cargo: 1.78.0 (54d8815d0 2024-03-26)
    ✔ rustup: 1.26.0 (5af9b9484 2023-04-05)
    ✔ Rust toolchain: stable-x86_64-pc-windows-msvc (default)
    - node: 20.11.1
    - npm: 10.2.4

[-] Packages
    - tauri 🦀: 2.1.1
    - tauri-build 🦀: 2.0.3
    - wry 🦀: 0.47.2
    - tao 🦀: 0.30.8
    - tauri-cli 🦀: 1.2.2
    - @tauri-apps/api : 2.1.1
    - @tauri-apps/cli : 2.1.0

[-] Plugins
    - tauri-plugin-shell 🦀: 2.0.2
    - @tauri-apps/plugin-shell : 2.0.1

[-] App
    - build-type: bundle
    - CSP: unset
    - frontendDist: ../build
    - devUrl: http://localhost:1420/
    - framework: Svelte
    - bundler: Vite

Stack trace

No response

Additional context

This issue does not occur when decoration: true

[ansirotenko]

In addition, after updating to tauri 2.0.6, for any window with decoration is set to false view higit will be calculated wrongly.
For example for window with settings:

{
    "width": 530,
    "height": 285,
    "decorations": false,
}

actual hieght will be 324 pixels.

In case decoration is set to true, hight will be calculated correctly

[itunic]

I also encountered this issue: when setting decoration to false, there are problems with width and height calculations, and the window's move handle (title bar) also doesn't work properly, and it never takes effect.

[amrbashir]

this should be fixed with the next release of tao see tauri-apps/tao#1010

[itunic]

this should be fixed with the next release of see tauri-apps/tao#1010tao

Thanks for the update. Could you please let me know when the next release is expected to be out?

[ansirotenko]

It seems on tauri version v2.2.2 this issue is gone.