[Breeze] [Bug 503598] New: Breeze gtk theme of gtk4 application has incorrect round corners

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=503598

            Bug ID: 503598
           Summary: Breeze gtk theme of gtk4 application has incorrect
                    round corners
    Classification: Plasma
           Product: Breeze
           Version: 6.3.4
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: gtk theme
          Assignee: plasma-b...@kde.org
          Reporter: q1253328...@163.com
                CC: agrine...@gmail.com, uhh...@gmail.com
  Target Milestone: ---

Created attachment 180836
  --> https://bugs.kde.org/attachment.cgi?id=180836&action=edit
The screenshot

The breeze theme for gtk4 application shows a wierd round cornering inside the
headbar


STEPS TO REPRODUCE
1. Implement a simple gtk4 app that uses system title bar

OBSERVED RESULT
A round corners below the system headbar, black background on the removed part


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch linux
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.9.0

ADDITIONAL INFORMATION
The rust snippet to reproduce:

let app = gtk::Application::builder().application_id("IIII").build();

app.connect_activate(|app| {
    let window = gtk::ApplicationWindow::builder()
        .title("test")
        .application(app)
        .build();

    window.set_child(Some(&{
        let vbox = gtk::Box::new(gtk::Orientation::Vertical, 8);

        vbox.append(&gtk::Label::new(Some("hello, world")));

        vbox
    }));

    window.present();
});

app.run()

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