highlighting editable cells in the table

[Andriy Rysin]

In keyboard layout configuration table there are 4 columns and cells from
last two columns (variant and label) are editable. But there's no clear
indication of this (
http://dict.linux.org.ua/other/kcm_keyboard_editable_cells.jpg).
Does anybody know a standard (KDE or QT) way of highlighting such cells? I
can of course do some background or border but if there's already common way
to do it I'd prefer to use it.

Thanks,
Andriy
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