Facebook chatheads disappear when out of memory on Android

Since upgrading to android 5.0 on my redmi 1s, I find that RAM management has become more aggressive. My phone has a pretty small amount of ram (1GB).

When I open a facebook chat head, it will close, often when I am halfway with writing a message. Is there any way to lock the chat head to memory so that android's low memory killer does not kill it?
I have tried enabling notifications, but it still disappears.

I have a rooted phone, and xposed is possible.

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