...on document reopening when Navigator window was previously in
Headings/Outline Content Navigation View mode

Change-Id: I169df15e81c4e9acf24c0e76d7f720af598c5b93
Reviewed-on: https://gerrit.libreoffice.org/60910
Tested-by: Jenkins
Reviewed-by: Jim Raykowski <raykowj@gmail.com>