<AWT Dev> [11] RFR 8187635: On Windows Swing changes keyboard layout on a window activation

[Dmitry Markov]

Hello,

Could you review a fix for jdk11, please?

 bug: https://bugs.openjdk.java.net/browse/JDK-8187635
 webrev: http://cr.openjdk.java.net/~dmarkov/8187635/webrev.00/
 
Problem description:
On Windows platform if AWT/Swing app is inactive (does not have focus) and user changes keyboard layout, the app window will receive the message WM_INPUTLANGCHANGE upon activation. During message processing we do NOT set the following flag g_bUserHasChangedInputLang. So the keyboard layout is switched back by AWT toolkit via WM_AWT_ACTIVATEKEYBOARDLAYOUT event. 

Fix:
It is necessary to set the flag g_bUserHasChangedInputLang during processing of WM_INPUTLANGCHANGE to block execution of activateKeyboardLayout() from AwtToolkit.WndProc().

Testing:
I ran related AWT/Swing regression tests and did not observe any new failures.

Thanks,
Dmitry
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