Review Request: Fix KRunner's 'spell in foreign language' feature

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This review has been submitted with commit 124e35885b8cd1b593b7b83a070bd0bdb5758661 by Simeon Bird to branch KDE/4.9.

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On Oct. 26, 2012, 11:26 p.m., Simeon Bird wrote:
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> http://git.reviewboard.kde.org/r/106244/
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> (Updated Oct. 26, 2012, 11:26 p.m.)
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> 
> Review request for Plasma, Sebastian Kügler and Matthias Fuchs.
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> Description
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> Krunner's spellcheck plugin has been broken since bd291d21f096a714a171e7af3a534ba345ca5659 (about two years ago) because it called Sonnet::Speller::setLanguage every time the spellchecker was invoked, which was not thread-safe. 
> This diff fixes the segfaults, and the feature, which I understand to be, basically, the ability to type 'spell french bonjour' and have it check the spelling.
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> The current code simply calls setLanguage on the second term in the search query, and then checks whether the resulting dictionary object is valid. The spell-checker expects languages like 'fr_FR' or 'French (France)' which the user was unlikely to type in correctly (at least, I never figured it out until I read the source). 
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> Instead, this patch create a new spell-check object (the creation is guarded by a mutex) when a new language is used (thus never needing to call setLanguage). Future queries use the already created speller for the new language, and spellers are deleted on the teardown() signal. 
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> We make a map between the speller codes and simple natural language language names in init(); this is a little bit tricky, because languages have sub-variants. My approach was to try and find the main language of the group: so 'french' gets you fr_FR.  For english I defaulted to US english. 
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> I have not tested this spelling an asian language as I don't speak one.
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> I have not implemented 'spell canadian french' or similar. If you want a specific sublanguage you have to type in the language code directly.
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> This addresses bugs 264779 and 303831.
>     http://bugs.kde.org/show_bug.cgi?id=264779
>     http://bugs.kde.org/show_bug.cgi?id=303831
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> Diffs
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>   runners/spellchecker/spellcheck.h 492c370 
>   runners/spellchecker/spellcheck.cpp 672732d 
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> Diff: http://git.reviewboard.kde.org/r/106244/diff/
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> Testing
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> Compiled, installed, ran for a week and spell-checked a bunch of things in European languages.
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> Thanks,
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> Simeon Bird
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