"Expand All" option for trees, e.g. Tax Codes

When looking at the Chart of Tax Codes, the codes appear as a collapsed tree, only one line is visible.

Is there a keystroke to “Expand All” and show the hole tree?

I tried right clicking on the first visible node and I didn’t see any option to expand the whole tree.

It is possible to do in tryton using a keyboard shortcut. There is also a proposal to add a similar functionality for sao. See: