It seems no to be foreseen that with Libre Office Writer one can make a comment into a text passage that already is marked up with another comment: a nested comment so to say.
Visually it sometimes look like the comment #2 is embedded in the comment#1.
But if you save the output and extract the zip and look into content.xml a comment#2 that you included into a comment#1 will not be shown and strange behavior can be seen.
Faulty behavior becomes more explicit ones the ODT is reloaded: no nested comments visible.
We would have needed this functionality of nesting one comment into another one for our W3C ITS2.0 Implemenation of Libre Office (more info on: http://www.init.de/en/libreofficeWriter). There we want to create and readout comments using the UNO API but now will use bookmarks to stick additional information to a text.
Ways to reproduce:
1.) Create a new Writer Document
2.) Write some text
3.) Make a selection on text
4.) Insert an annotation #1
5.) Make a subselection on the large annotation
6.) Insert an annotation #2
7.) Make a subselection on the large annotation again
8.) Insert an annotation #3
9.) Save the Document to ODT / ODF (both buggy)
10.) Close Writer
11.) open content.xml with an editor and see comments not inserted properly or reopen ODT in a new libre office writer and see the missing comments
Behaviour seen in LO 3.6.5 and 4.0.1 on Windows platform
Sure - we don't have conversational or nested comments; it's an enhancement we'd like - we're accepting patches of course :-)