OPERATING SYSTEM(S):
Redhat Enterprise Linux AS version 4(RHEL4) and RHEL3.

FULL JDK VERSION(S):
java version "1.5.0_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
Java HotSpot(TM) Client VM (build 1.5.0_03-b07, mixed mode)

DESCRIPTION:
Steps to Recreate:
1. Download these input method tools.
http://java.sun.com/products/jfc/tsc/articles/InputMethod/InputMethodHotKey.jar
http://java.sun.com/j2se/1.5.0/docs/guide/imf/spi-sample/CityIM.jar

2. Launch InputMethodHotKey.jar and define a hot key combination. such as Shift+F4
$ java -jar InputMethodHotKey.jar

3. Install CityIM.jar into jdk/jre/lib/ext directory.

4. Login GNOME environment.

5. Launch JTextArea with Motif Toolkit. For example, notepad demo (demo/jfc/Notepad/Notepad.jar).
$ AWT_TOOLKIT=MToolkit java -jar Notepad.jar

6. Press the key combination you chose in step 2, and choose City Input Method.
    Any language of CityIM can recreate the problem.

7. Type "tyo" and press space key twice to invoke lookup window.

8. Minimize JTextArea window

Result
Lookup window remains.

Expected Result
Lookup window should be minimized or closed.

Additional Information:
1) Does not occur on XAWT.
2) Does not occur on KDE.
3) Occurs on 142, too.