Ideally content entries in the Navigator tree are shown as 'grayed out' when the content they refer to in the the document view is not visible due to being in a hidden section or in outline content that is folded. Currently this doesn't happen for content in hidden sections. This patch makes content entries in the Navigator tree 'grayed out' when the content they refer to in the document view is in a hidden section. Change-Id: I1a0f39ee4a1c336a12f814a813b764a12a030c42 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/195214 Reviewed-by: Jim Raykowski <raykowj@gmail.com> Tested-by: Jenkins