add print stack
signature backup.
upgrade. recalculate dock item.
if there are overlay, clean db when loader
fix exception sometimes.
fix exception and add locker.
Refactoring.
Fix exception. Fasten over drag.
widget check , over efficiency, on drop efficiency.
Change lp to itemInfo.
Add put_screen for future usage.
Refactoring.
Add try catch.
Change lp to iteminfo.
Restoring!
Upgrade
goto default screen when startup.
iteminfo and lp issue. tostring issue.
iteminfo and lp