EDIT

I will implement the update script now so we also need the fields in taxeditor

This should be implemented now, please review.

For Person the result of the collectorTitleCache field should only be displayed but not be editable.

This still seems to be missing. We either need a separate field or label here or we could show the text in the "background" of the given field (like sometimes usage hints are shown in empty fields) as long as the field is not yet filled with any text. I don't know if this is possible in RCP, if yes, this might be the preferred solution as it keeps the UI simple.

Andreas Müller wrote:

It seems to work now.

However, there is another problem now. The protect button is disabled for all titleCache fields if the cache is not protected. This is the case not only for persons but for all xxxCache fields in Details View.
Maybe this is related to changes in #9287

this is fixed. Please have a look whether all toggleable text fields are fixed.

Works as expected now

A final minor issue. Can we use a grey which is a bit more light? Currently, at least on my screen, it is difficult to distinguish really existing values (which should be darker) from cache values (which should be more light).