"When an always-on-top window is sent toBack, its always-on-top state is set to false".
I have two frame, Frame1 is set to always-on-top state. when the both the frame are visible, i am setting the frame1 toBack , then i checking whether frame1 is on top using isAlwaysOnTop(), this method should return true, but it return false.

Step to reproduce:
---------------------
1) Run the attached program. You can see two frame.
2) see the console for the output. you will see the following output.
----------------------------
frame1 is visible
frame2 is visible
"Yes frame1 is on top" ----->( this should be "no")
no frame2 is not on top
----------------------------
If you see the same output , then the bug is reproduced.
I tested this on Tiger FCS b64 to Mustang b85 & is still reproduced.