Projects list js

Changes and clean up for the navbar project list dropdown:

• When the dropdown is displayed:

  • Apply focus to the active list element to position the
    scrollable area over that element.
  • If the list is empty, apply focus to the searchbox.

• Manage key events in the dropdown elements:

  • When using the list and any key not related to list navigation is
    pressed (for example, typing a text for searching), switch the focus
    to the search box for it to receive the input.
  • When using the searchbox and any key of up, down, pageup, pagedown,
    is pressed, switch the focus to the list to allow navigating with
    keyboard.
  • Escape key in the search box will close the dropdown.

• Fix hiding the searchbox when only 10 or less items are displayed.

• Code clean-up:

  • Move all the code related to the navbar projects menu to the same
    place in the js file.
  • Rename variables for less probability of collision with other
    unrelated code.

Fixes: 0023037, 0025594