Cannot navigate to original message of a reply when not in local messages model

[Flohack74]

Currently it is not possible to jump to a message that is not in the in-memory message model. For this to succeed we must:

1) detect the missing message and load it into the local app 2) understand how the message model requests new messages when scrolling 3) load older messages and navigate to the context around the clicked reply original

This is considered as a bug, since there is no hint whats going on, clicking simply fails.