Windows 10 Virtual Desktops and flashing taskbar buttons on all virtual desktops, still on insider builds?

[Ciantic]

I'm on stable 10240.

There is a feature in Windows 10 virtual desktops which is driving me absolutely crazy: flashing taskbar buttons (WinAPI user32.dll call FlashWindow and FlashWindowEx) appear in all virtual desktops. If I could control which program is allowed to do this, it wouldn't be so bad.

But how it's implemented in 10240 right now, it's just annoying, I keep getting flashing taskbar buttons from other desktops appearing on my work desktop, and this is just awful distraction.

Another odd thing is that if I quickly switch desktops, it sometimes randomly flashes an application e.g. Chrome or Visual Studio window, and it appears in another desktop, which kind of defeats the purpose of having virtual desktop in the first place.

Can someone confirm if flashing taskbar buttons still appear on all virtual desktops with insider builds?

I've been using VirtuaWin (open source virtual desktop implementation) before Windows 10, and it does not suffer from this, but we shouldn't need to resort to 3rd party virtual desktop solutions anymore since Windows supports virtual desktops.

Thanks.

Edit: I've considered patching user32.dll and just make FlashWindow(Ex) operation to do nothing, but I suspect this is not a good solution with all the antimalware/signing things these days.

Edited October 26, 2015 by Ciantic
typo, clarification

[Ciantic]

Damn. I confirm this myself. I installed a insider build 10565 on Hyper-V, same problem.