Comment 2 for bug 1742830

This isn't documented anywhere - unless you're asking for arrows being added to the interface, maybe?

Probably having two issues, one for shortcut, one for user interface improvements, makes sense. Been trying out a couple of keys, following https://www.w3.org/WAI/GL/wiki/Using_ARIA_trees . Some keys work, some don't.

* : expands all in currently selected element
Home : jumps to topmost visible element
End : jumps to bottom visible element
arrow up : one visible element up
arrow down : one visible element down
Ctrl+F : start search
type any letter or number : start search
Esc : leave search, leave current field, leave dialog
Tab : iterate through siblings of current element, when navigating tree
Tab : iterate through fields of dialog (doesn't work when starting in tree view, due to the siblings iteration)
Ctrl+Enter : set changed value (documented)
Del : Delete currently selected element
Ctrl + C : Copy element
Ctrl + V : Paste element (pastes it on top of all elements in the group you're in (so, at the bottom in the list in the XML editor), like it normally would. Ignores where you are currently in the tree).
PgUp / PgDn : Jump to top / bottom element that is still visible in the dialog without scrolling

Cannot collapse selected elements, at least I don't find right/left arrow work, not sure what else to try.