<AWT Dev> Preedit string is still exist after focus change operation

[Deven You]

Hi All,

I found there is a problem with our IMF(Input Methods Framework) when 
dealing with DBCS input like Chinese and Japanese on Windows 7 32bit env.

The simple scenario is if your application has 2 windows and then:

1: focus on first window, change to microsoft pinyin input method 
Chinese mode.
2: Input some words, leave some words in preedit string not committed.
3: Move focus to the other window, change to English mode and input 
something
4: Move back to the first window. It is in English mode, but the preedit 
string is still there(this is the bug).
5: Delete the preedit string with backspace and press enter, it appears 
again.

I have raised  a sunbug for this issue, the internal ID is: 9002399

I have written a test case[1] to reproduce this problem on windows 7 32 
bit machine with latest OpenJDK 8.
Since I am not clear how to run this test case as a jtreg, I just put it 
to cr.openjdk.java.net. There are several files within this test case:

actual-step*.png                    Steps reproducing the bug. (can not )
JTextAreaTest3.java                 The test case.
Readme.txt                              Simple description
IMF_04_69120.txt                    More detail.

I also made possible patch[2] for this problem.

Please anyone take a look at this issue and give your suggestion.

[1] http://cr.openjdk.java.net/~youdwei/ojdk-687/IMF4/ 
<http://cr.openjdk.java.net/%7Eyoudwei/ojdk-687/IMF4/>
[2] http://cr.openjdk.java.net/~youdwei/ojdk-687/webrev/ 
<http://cr.openjdk.java.net/%7Eyoudwei/ojdk-687/webrev/>

Thanks a lot!
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