Message Bubble

I hope to add transparent background support for message bubbles to make it look more transparent. At the same time, I hope to distinguish the color of the message bubbles I send from others so that I can accurately identify which messages I send.

The issue names message bubbles but does not identify a theme file, test, or entry point. Start by locating the Telegram theme definitions for bubble backgrounds and sent-versus-received message colors; done means transparent support works and sent messages are visibly distinguishable from others.

Written by the indexing model from the issue text.