Optional setting to honour the display settings

Hm, I'd say that this should be a configurable setting, showing all fields by default (as is the current behaviour), as long as the user has permissions to see them according to the role memberships. I agree that this option is desirable on some sites, though.

Any thoughts on the implementation of this? I'm going to look at this for the field formatters if I get time.

I think that the cleanest and most configurable way would be to add field instance settings, but would like to know your thoughts before attempting this myself.

i.e. A fieldset with:

> --- Diff -----------------
[ ] Exclude from diff comparisons
....
For the text fields
Select components to compare:
[ ] Summary (if applicable)
[ ] Content
[ ] Text format (if applicable)

Select rendering options for the text
(*) Raw HTML
( ) Raw text
( ) Rendered HTML (if applicable)
( ) Rendered text (if applicable)

My initial thought was a customizeable setting tick mark for "[Tick] Enforce display of all fields regardless of their display settings (hidden/visible on node view)".
A tick mark should default to "on/enabled", as is the situation now, and then users could choose to remove it to get the effect that kadimi is suggesting in the initial post here.

I am not sure if we are talking about the same thing here, but perhaps I just dont understand the example in #4.

OK, to paraphrase.

kadimi was referring to the view modes (i.e. admin/structure/types/manage/page/display)

I think that you may be referring to a global level diff configuration or maybe content type configuration?

I'm referring to a field instance setting (admin/structure/types/manage/page/fields/body)

Trying to summarize the options (in 10min without much thought):

I'm going to try and look at finishing off the diff support for all core types tonight, and this is a fundamental decision on how to handle these. (Though it doesn't really hold anything other than testing up)

Actually #1 appears to be a good option, notes in #1347316: Selectable view mode for inline diffs and "Current revision" display view mode.

Some time this weekend I'll clone diff into a sandbox project with the working prototype.

This should be resolved with the new branch, 7.x-3.0-alpha1 or 7.x-3.0-dev.

This is still alpha, so test carefully before use on a production site and report any issues back to the queues.