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Unfortunately Wing doesn't handle right-to-left text correctly, which is why it's overwriting text in this odd way. This is due to lack of complete right-to-left language support in the underlying text editor component, Scintilla.
However there has been some progress on supporting this and we may be able to improve this by updating the version of Scintilla that we use. I'll see if we can look at doing that soon, although I don't know for certain it will solve it completely.
Sorry about this problem!