Either I'm blind, or it isn't there. In the previous Tortoise, there was a checkbox above all other files for select/deselect all files.
In the new one, I can't find this functionality anywhere. I can select a bunch of files from the list, but there's no select/deselect all on the context menu.
I also don't see a select/deselect all on the menu.
Suspect this is also the case in the commit tab when working in the workbench, but haven't confirmed yet.