Text input stalls in Nautilus with iBus whenever SHIFT key is pressed

[Yoichi Aso]

Version of Mint: 12 (amd64)
Desktop Environment: gnome3

Problem Description:
Text input in Nautilus (like renaming a file) stalls when iBus is used.
Actually, it works OK until SHIFT key is pressed. Once you press SHIFT key,
then the next time you want to input text, no keyboard input is recognized.

Way to reproduce the problem:
1. Enable iBus through, for example, im-config.
2. Open a Nautilus window
3. Create a new file. Change the name to "Test.txt". (This involves pressing SHIFT key to enter "T").
4. Right click on the file and try to rename the file again.
5. Now there is no response to the keyboard input.
6. Once you are in this state, you cannot also input, for example, server name in the connect to server dialogue.

This problem does not happen when no input method is used or scim is used instead.