<AWT Dev> [7u] Review request for 8061954: 7u76 - deployment warning dialogs do not work on Linux

[Anton Litvinov]

Hello,

Could you please review the following fix for P1 bug.

Bug: https://bugs.openjdk.java.net/browse/JDK-8061954
Webrev: http://cr.openjdk.java.net/~alitvinov/8061954/webrev.00

The bug consists in the fact that "java.lang.NullPointerException" is 
thrown from 
"java.awt.KeyboardFocusManager.getCurrentKeyboardFocusManager" and a 
button does not get the focus on mouse click, when the button is located 
on a warning dialog which is shown during Java applet loading on Linux OS.

The solution consists of 2 following parts:
1. Reversal of the fix for JDK-6993873 in order to resolve this bug 
(file "XContentWindow.java").
2. Backport of only Linux/Solaris parts of the fix for JDK-6981400 from 
JDK 8 in order to again resolve JDK-6993873 (the failing test 
"jdk/test/java/awt/Focus/FocusOwnerFrameOnClick/FocusOwnerFrameOnClick.java").

The next jtreg regression tests were run on JDK 7 without/with the fix 
and no new test failures were defined:
     jdk/test/java/awt/Focus
     jdk/test/java/awt/KeyboardFocusmanager
     jdk/test/javax/swing/KeyboardManager
     Analogous tests from closed parts of JDK 7.

Thank you,
Anton