Read or full screen mode

It is known how uncomfortable reading long messages are in the current chat view, and worse in groups, where the messages are even narrower. Besides that it is not pleasant to read the html messages in plain texts, more than one Delta user has told me, and that is when they receive an html email

So :
I recommend a full screen view of long and incomplete messages

Long messages:
. When they exceed more than 3 screens

Incomplete messages:
. Html messages
. Mail messages
. Messages that for x reasons are not shown complete

Currently, incomplete messages are displayed with this symbol […]
I think it could be replaced by a button with which the message must be in its original format, in a separate view
Only the text of the message, perhaps the subject as a header.

Note: I am not proposing a classic mail view