Remove dangerous flag (deprecated)

Bump to version 6

Beter exception handling

Fix opaque panels with partially maximized windows regression

Need to check if window is maximized when a maximized signal is fired
because if it is horizontally/vertically maximized only it will
return false and the panels won't change.

Performance improvement: don't loop when innecesary

Take benefit of the information provided by the window that
fired the event.