News in 3.7.3
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* Deprecate gtk_source_completion_move_window()
* Deprecate gtk_source_completion_info_get_widget()
* Deprecate gtk_source_completion_info_set_widget()
* CompletionInfo: always a natural size
* Simplify internal code for the completion (new CompletionModel)
* Fixes for the style schemes and GtkSourceMark
* Other misc bugfixes
* Updated translations