[Feature Request]: Make an option to make BrowserView completely opaque

[kaizjen]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem Description

Currently, when a BrowserView is on top of another BrowserView, the background view still displays its content over the foreground one, given that the FG browserview doesn't have a css-defined background color.

The blue is the background color of the foreground BrowserView (set via view.setBackgroundColor()), and the red - of the background view. The text is in the red view, but is displayed over the blue view, because the blue view has the background only set by view.setBackgroundColor() and not css.

Proposed Solution

It would be nice to be able to have a BrowserView.prototype.setOpaque(isOpaque: boolean) function that will tell Electron to render the BrowserView over everything else (respecting its z-position on the window, of course).

An alternative way to solving this is just to render the background color of BrowserView above all the "lower" BrowserViews, covering them. But some people might actually rely on that functionality, so, perhaps, it's not the best solution.

Basically, with view.setOpaque(true), it should look something like this:

Alternatives Considered

Of course, the obvious solution is to set the background-color: white, or something non-transparent in the css of the BrowserView (that's how I made the second screenshot), however, BrowserViews are usually used to display external (and unknown) content, and you will either add background-color: white and affect non-transparent pages, or affect transparent pages by doing nothing.

Additional Information

No response

[pushkin-]

Would this PR address this issue?

[kaizjen]

Yes, thanks.

I don't know if I should close this now, becuase the PR hasn't appeared in a normal release yet.