As a user with Browse permission, I can browse compound documents using the navigation tree

As a user with Browse permission, I can browse compound documents using the navigation tree

This story is a generic one used for common AC across the navigation tree, to avoid repeating them.

AC
Files are shown in the following order:

• compound 1 parent doc
• compound 1 children documents
• nested compound parent doc
• nested compound children documents

Browsing the tree can be done in that order using a keyboard

Browsing compound documents in general respects the WCAG 2.1 level AA guidelines for accessibility, and in particular:

• http://www.w3.org/TR/WCAG20/#content-structure-separation-sequence
• http://www.w3.org/TR/WCAG20/#keyboard-operation-keyboard-operable
• http://www.w3.org/TR/WCAG20/#keyboard-operation-trapping
• http://www.w3.org/TR/WCAG20/#visual-audio-contrast-without-color
• http://www.w3.org/TR/WCAG20/#navigation-mechanisms-focus-order