Theia not synchronize the background color of the electron window when changing the theme

[lqd1434]

Bug Description:

Theia not synchronize the background color of the electron window when changing the theme

Steps to Reproduce:

1.open theia ide
2.change theme to dark
3.refresh window ,and we can see a white screen flash then become dark

Additional Information

this issue can fixed by follow code

// core/src/electron-main/electron-main-application
override setBackgroundColor(webContents: WebContents, backgroundColor: string): void {
        BrowserWindow.fromWebContents(webContents)?.setBackgroundColor(backgroundColor);
        this.customBackgroundColor = backgroundColor;
        this.saveState(webContents);
    }

This seems like a simple fix, I wonder if theia has other considerations or if it's just me got the issue

• Operating System: ubuntu22
• Theia Version: latest

[JonasHelming]

@rschnekenbu

[Keithyumi]

Can we change theia's background colour? When using the light theme, when the page hasn't loaded yet, it will show a white screen, which makes the application look especially slow, and it won't feel so strong if it's a black background!