Reset key focus when the key focus widget is hidden
Merge pull request #4 from scrawl/keyfocus

Reset key focus when the key focus widget is hidden
Fix child Overlapped widgets picking order.
Make both overlapped child widget and parent overlapping widgets go up.
add test deep
redraw by deep
fix editor picking
fix typo deep -> depth property
rename deep to depth in various places in LE

(not related to widget's depth property)
fix depth
add version 3.2.1 change log
Display Depth property only for child widgets in LayoutEditor
Update Depth property description
Fix documentation typo