Filebrowser: Make Shift+Tab go up the tree

[egabrum]

Currently, in the FileBrowser, Shift+Tab has the same effect tas Tab: go down the next hierarchical level.
To go up one level, the user needs to use Backspc. It would be natural and intuitive to use Shift+Tab to go up one level too.

Edit: Backspc instead of Del

[polyvertex]

By Del I assume you meant Backspace? If that's so and in case you've missed it, you can hit Ctrl+Backspace to ease the "step back" action. That will erase the last word according to the current position of the caret. (I've just updated the "Keyboard Shortcuts" chapter of the doc internally)

Regarding your request, I'm not comfortable with assigning Shift+Tab right now for plenty of reasons that are too long to detail here. Bottom line is that we would quickly reach a point where KP needs a way to allow shortcuts mapping by the user, which is clearly not on the roadmap, as opposed to the plethora of things that are already scheduled.
That being said, something like a Shift+Left or Ctrl+Left might be conceivable and implemented with its counterpart (Shift+Right or Ctrl+Right).

[egabrum]

Understood.
And yes, I meant Backspc, not Del.

[polyvertex]

Gave some more thought about it. Alt+Left will be bound as a "go back in current search history" action, which gives the illusion of a "go up" action in that specific case.

That combination is more conventional than Ctrl+Left or Shift+Left and is used that way by at least Windows Explorer, Chrome and Firefox applications.

EDIT: Alt+Right has been implemented as an alias of Tab.

[polyvertex]

Implemented in 2.9