Android shouldn't notify me of a new message if I have the window open in another app

#### Describe the bug
I am having a conversation with someone using element-web and every time they send me a message, my android app notifies me.

#### To Reproduce
Steps to reproduce the behavior:
1. Have a conversation in a room with noisy notification settings.
2. Keep the window open on the other device
3. Android app buzzes every time I receive a message even though I have the conversation open elsewhere

#### Expected behavior
If I'm actively viewing a room, I don't have notifications on any other device

#### Smartphone (please complete the following information):
- Device: Pixel 2
- OS: Android 11

#### Additional context
- App store, version 1.1.15 [40101152] (G-b2969)
- Homeserver: matrix.org