Replies are lost after switching sources

[sssoleileraaa]

Description

Lost replies when clicking from one source to another.

STR

1. Type into the reply box
2. Before sending, click a different source
3. Click back to the original source that you were replying to, and see the reply is lost

This has to do with the way we create new SourceConversationWrappers whenever a new source is selected.

Proposal

2 parts:

1. When we recreate our list of sources every time there's a sync, also create the corresponding conversation views associated with those sources, instead of waiting until a source is selected. By default, hide these conversations.

2. When a source is selected, show the corresponding conversation.

This will make it so the text in the replybox gets hidden instead of deleted.