Shift key triggers words to be inserted again and again

[kong0107]

Environment: Ubuntu 12.04.3, auto-installed chewing.

While entering some Chinese words and press enter, shift key which is supposed to only switch to English input also doubles the string which was just entered. Press shift key again (which should switch back to Chinese input) would copy the entered string again.
Switching from English mode to Chinese mode would trigger the same bug.

Steps to trigger:

1. Enter "測試" without pressing enter key.
2. Press enter key exactly only once to confirm the input. That is, no underline anymore.
3. Press shift key once. There would be "測試測試" then.
4. Press shift key more would multiply the entered words. That is, "測試測試測試" or even longer.

More detailed:

• Change the cursor position after step 2 by arrow keys would NOT avoid the bug.
• Change the cursor position after step 2 by mouse would DO avoid the bug.
• Before pressing enter key, switch input language would NOT avoid the bug. That is, in step 1, the entered string could be "測tESt試".
• A white space is also possible to be duplicated.

Another person with same experience in PTT (written in Chinese).

[czchen]

Please help to try the daily build in https://launchpad.net/~chewing/+archive/chewing to see if the problem is still present, thanks.