Strange background effect on emulator (and some devices)

[amanzan]

I'm testing with an emulator (Pixel 4 API 29) and I am noticing a strange effect when opening a SuperBottomSheet. It happens at the top, it's like a flick when opening. Seems like it's not doing the slide animation in a smooth way for some reason. I also tested in a device (Realme X2 PRO) with a similar effect.

But here's the weird thing: using exactly the same example with the same code, I tested in 2 other devices (Redmi and Huawei), and it works very well and smooth, without any strange effect or anything similar.

I assume this is not an easy bug to identify, but just in case, any idea what could it be, and how to solve it?

Attached video for a better understanding of the issue:

Screen.Recording.2021-03-09.at.19.21.17.mov

[RahulSDeshpande]

@amanzan @andrefrsousa

The background grey effect is actually mocked in the library.
It means, in the library layout there is a fake faded grey background.

So when the bottom sheet starts appearing, this fake background also starts appearing & thus you see this strange effect 😄

For reference, you can check this layout super_bottom_sheet_dialog.xml.