Message grouping in timeline like element-web

#### Describe the bug
Messages by the same user are grouped in the timeline on certain conditions (delta of timestamp?), omitting repetition of the sender name and avatar.

Web groups a lot more where android is more likely to print sender name even when messages are sent within a minute.

#### To Reproduce
Steps to reproduce the behavior:
1. Send a couple messages in quick-ish succession
2. compare to web

#### Expected behavior
same grouping unless for a good reason like sender name leaves the screen

#### Smartphone (please complete the following information):
- Device: Moto G5S+
- OS: Android 10

#### Additional context
- App version and store 1.1.7 Fdroid (... please host own, up2date repo)
- Homeserver: private