Recently, the handling of spell checking for upper-case words was fixed in Sonnet::Filter. While this might now work correctly with KTextEdit widgets through Sonnet::Highlighter, although potentially configured differently upper-case words might still be spell checked with Sonnet::BackgroundChecker. This is due to the fact that Sonnet::BackgroundChecker does not possess a way to load or reload specific spell checking configurations.

This patch fixes the problem by adding a 'restore' method to Sonnet::BackgroundChecker, which allows it to read a spell checking configuration and then to pass it on to the filter object that is used internally. The implementation is similar to what is done inside Sonnet::Highlighter.

This patch should also be back-ported to 4.5 eventually.