Is it possible to disable Gmail's default behaviour of hiding what it thinks is quoted text and always have the whole body of every message visible?
1All the 'solutions' I've seen involve you having to take gmail out of "conversation view". Either permanently in Mail Settings, or for the current thread by altering the subject when you reply so that a 'new' conversation is created and the quoted text is shown. However, neither of these are what I'd call a solution since you lose functionality ie. the conversation!– MrWhiteAug 28, 2011 at 22:39
As far as I can tell, this feature is not available.
Proving the absence of something can be a challenge, but in this case I'm relying on a sampling of discussions of this subject in the Gmail Product Forums where no solution is proposed, and Google Support is totally quiet. Not posting all links here, but some include: