If you are using the main C++ distribution of wxWidgets, Feel free to ask any question related to wxWidgets development here. This means questions regarding to C++ and wxWidgets, not compile problems.
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wxRichTextCtrl has BeginLineSpacing() - EndLineSpacing() "brackets", wxRichTextAttr has GetLineSpacing() method. The wxRichTextCtrl has also GetDefaultStyleEx() method which can be used for obtaining wxRichTextAttr for subsequently inserted text.