Bug 615158

Description of problem:

Got some feedback from a m17n Wijesekera keyboard layout user who is involved in publishing. He finds it difficult to work for long periods of time using IBus because the pre-edit buffer has a background colour that is different to the rest of the application's text input box.

Could we add a tick box option in the IBus preferences that toggles between setting the background colour of the pre-edit buffer and underlining the pre-edit buffer with no change to the background colour. SCIM underlines the pre-edit buffer, which appears to improve usability.

At the moment, the particular user has had to switch back to SCIM because using IBus was affecting his productivity.

Version-Release number of selected component (if applicable):
ibus-chewing-1.3.4.20100608-1.fc13.i686
ibus-pinyin-db-android-1.3.8-1.fc13.noarch
ibus-anthy-1.2.1-1.fc13.i686
ibus-libs-1.3.6-1.fc13.i686
ibus-pinyin-1.3.8-1.fc13.i686
ibus-m17n-1.3.0-1.fc13.i686
ibus-1.3.6-1.fc13.i686
ibus-hangul-1.3.0.20100329-1.fc13.i686
ibus-gtk-1.3.6-1.fc13.i686
ibus-rawcode-1.3.1.20100707-1.fc13.i686

How reproducible:
Always

Steps to Reproduce:
1. open gedit
2. select the Wijesekera keyboard layout in IBus
3. type the key sequence: fkda

Actual results:
* The text in the pre-edit buffer appears with a black background colour.

Expected results:
* The text in the pre-edit buffer appearing with the same background colour as the rest of the text input box. Alternately, underline the text in the pre-edit buffer instead of changing the background colour.