Issue # 1 with java.awt.Frame
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I have a frame with two panels. JPanel with one awt button & a swing button added to the north of the frame & it is set with yellow background color . AWT panel with awt button & a JButton added to the south of the frame & it is set with green background color. When i resize the frame, i can see that JPanel is not getting resize properly along with the mouse movement & AWT Button impression can be seen & making the frame smaller , AWT button is seen on the JButton & it is erased for a while atleast for a second or two. Another issue is that swing button added to the AWT Panel flicker while resizing the frame.

Issue # 2 with javax.swing.JFrame
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Adding the same components to the JFrame & repeating the same scenario, painting artifacts can been.

Step to reproduce:-
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Issue #1
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1) Run the attached testcase.
2) Resize the frame. Observe that north panel yellow color is not getting resize properly along with the mouse movement & south green color panel, the swing button flickers . If you see the same , then the bug is reproduced.

Issue # 2
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Change Frame to JFrame & uncomment the commented lines.
1) Run the attached testcase.
2) Resize the frame, Observe while resizing painting artifacts is seen for few seconds say 1 to 2 seconds. If you see the same then the bug is reproduced.
Failed test:
AWT_Mixing/Automated/OtherOverlapping/MixingPanelsResizing.java jtreg