#370 better usability of shift left/right in popup menu

[Radim Kolar]

For better readability it would be nice:

1. change order of lines
Shift Left
Shift Right

Because we are writing from left to right, so its more intuitive to pickup right item quickly without thinking about it

2. Consider adding directions for providing visual feedback
< Shift Left
Shift Right >

[Fabio Zadrozny]

Actually, the best would be just selecting the lines and using Tab or Shift-Tab (so, the popup should have the keybinding there).