8000 `with_maximized` causes a second window to flash and close on startup before the main window opens · Issue #5975 · emilk/egui · GitHub
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with_maximized causes a second window to flash and close on startup before the main window opens #5975

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Abestanis opened this issue Apr 11, 2025 · 0 comments
Open

with_maximized causes a second window to flash and close on startup before the main window opens #5975

Abestanis opened this issue Apr 11, 2025 · 0 comments
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bug Something is broken

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@Abestanis
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Abestanis commented Apr 11, 2025 •
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Describe the bug
When using the with_maximized(true) option on the ViewportBuilder, There is a small flash when the application is started. This can be sometimes very noticeable or sometimes not at all, it depends on the computer speed. This means it's not noticeable when I plug my laptop into power, somewhat noticeable when it's on battery, and very noticeable on my older laptop which is slower.

I recorded the behavior in front of a black fullscreen window at 10% speed:
Flicker at startup

Mp4 Video

maximised.mp4

To Reproduce
Steps to reproduce the behavior:

  1. Compile and run the following example: 
    #!/usr/bin/env cargo
---
[dependencies]
eframe = { git = "https://github.com/emilk/egui", branch = "master" }
---

use eframe::{
    egui::{CentralPanel, Context, ViewportBuilder},
    run_native, App, Frame, NativeOptions, Result,
};

struct Ui {}

impl App for Ui {
    fn update(&mut self, ctx: &Context, _frame: &mut Frame) {
        let _response = CentralPanel::default().show(ctx, |_ui| {});
    }
}

fn main() -> Result<()> {
    run_native(
        "Maximised",
        NativeOptions {
            viewport: ViewportBuilder::default().with_maximized(true),
            ..Default::default()
        },
        Box::new(|_creation_context| Ok(Box::new(Ui {}))),
    )
}
  2. See window flicker on start.

Expected behavior
No flickering at the start.

Desktop (please complete the following information):

  • OS: Windows 11 (Version 10.0.26100.3476)
  • Browser: NA
  • Version: NA
@Abestanis Abestanis added the bug Something is broken label Apr 11, 2025
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