Moves form but doesn't scroll.
If selected object isn't under cursor still moves the entire form.
Changed key press handling destination to desktop-widget for access to adjusments.
Needed to add mouse position tracking while moving.
Fixed move direction.
Cursor keys move only if mouse is over canvas.
Merge pull request #1 from iChaRil/scroll_on_cursors

Scroll when pressing cursor keys if no objects are selected.