Alt-tabbing sometimes creates duplicate "ghost" windows

[EvidentlyCube]

I've got an interesting problem and I am 95% sure it's related to the library.

When I use the library, using Alt+Tab on Win 11 sometimes causes a duplicate ghost window to appear:

There are three proper windows for Trans Neuronica here, even though it really is only a single one. Closing it will cause blank pseudo-apps to remain in there, same as you can see in the second row. The issue is very finicky to replicate though so it's possible that I was just lucky and it has nothing to do with it. Nevertheless, here are results from some of my attempts:

electronEnableSteamOverlay(false)

const x = require('./steamworks.js/index.js');
x.electronEnableSteamOverlay(false);
console.log(x);

Successfully duplicated a ghost after a few dozen of alt tabs

electronEnableSteamOverlay(true)

const x = require('./steamworks.js/index.js');
x.electronEnableSteamOverlay(true);
console.log(x);

Successfully duplicated a ghost after a few alt tabs

Comment out both appendSwitch()

const x = require('./steamworks.js/index.js');
x.electronEnableSteamOverlay(true);
console.log(x);

And I commented out the following two lines in index.js:

//electron.app.commandLine.appendSwitch('in-process-gpu')
//electron.app.commandLine.appendSwitch('disable-direct-composition')

Failed to duplicate a ghost after dozens of tries.
But also it's impossible to show the steam overlay.

Comment out in-process-gpu

const x = require('./steamworks.js/index.js');
x.electronEnableSteamOverlay(true);
console.log(x);

And I commented out one of the lines in index.js:

//electron.app.commandLine.appendSwitch('in-process-gpu')
electron.app.commandLine.appendSwitch('disable-direct-composition')

Duplicated a ghost after a few tries.
But also it's impossible to show the steam overlay.

Comment out disable-direct-composition

const x = require('./steamworks.js/index.js');
x.electronEnableSteamOverlay(true);
console.log(x);

And I commented out one of the lines in index.js:

electron.app.commandLine.appendSwitch('in-process-gpu')
//electron.app.commandLine.appendSwitch('disable-direct-composition')

Failed to duplicate a ghost after dozens of alt tabs.
And steam overlay seems to work correctly.

Summary

It seems that disable-direct-composition causes the issue and doesn't seem to be required at a first glance. I am sure that command wasn't added for no reason, so it would be great if:

• Comments were added to explain why both switches are added (as well as what exactly is the purpose of frame invalidation)
• And have a way to prevent disable-direct-composition from being appended.

I'm happy to add a PR for the latter but the former will require someone who knows the whys.

[ceifa]

Hey, which version of electron are you using to reproduce this?

[EvidentlyCube]

@ceifa The version I have in package.json is 23.1.3 with electron-packager on version 17.1.1 (though I don't suppose the latter matters).

[ceifa]

The disable-direct-composition is used to disable Microsoft DirectComposition. It being enable can cause weird render behaviors on the overlay over windows.

Maybe this is not a issue anymore on the newest versions... I will try remove it later.