qtbug66202.zip Incorrect screen count detection when screen count changed by OS.

Important moment: widget was created before screen count changed, but shown first time after screen count chaged.

attached app:
create widget (no show)
widget wait 10 secs
when timer (10 secs) is not timeout at "Display settings" change displays count.
widget show
widget print debug about screens

debug info if display 2->1:

widget created
"numScreens: 2"
"screen 0"
"0:0 1920 x 1080"
"screen 1"
"1920:0 1920 x 1080"

debug info if display 1->2:

widget created
"numScreens: 1"
"screen 0"
"0:0 1920 x 1080"