Completion order

[jj1uzh]

Thank you for developing this great library.

I think Completion order should be: UserDict(most recent selected order) → Others(sorted?)

To do that, I'm trying to do:

• Re-implement UserDict with an order-aware structure, such as List.
  • Lookup & Select(Reordering) may become slower.
• Change how to compose Completion results.

What do you think? Thank you.