Adopt signal-style bubble-styling of several messages of the same user

[AndyScherzinger]

From #2364 (review) - adopt chat bubble corner dynamics for multiple message of a single user, i.e. like signal:

[mahibi]

we already had this (chatMessage.isGrouped), seems to be broken right now..

[mahibi]

just noticed in passing:

the grouping seems to work fine but it's not handled design-wise (the first message is different, for the following messages the round corners are just too large). i guess this came with the switch to material3

[AndyScherzinger]

The generally larger corners came with the material3 changes, but nothing else, so where is the grouping logic to be found?

[mahibi]

Yes you're right material3 didn't change anything regarding the logic. The current behaviour is unchanged since ever, so it's indeed a feature request and not a bug.

We have the same behaviour like whatsapp. The first bubble is a "speech bubble" and the following ones are just rounded.

so where is the grouping logic to be found?

TalkSpecificViewThemeUtils#themeIncomingMessageBubble
TalkSpecificViewThemeUtils#themeOutgoingMessageBubble