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Now we can cope with a single wide or narrow pre-edit character, which is good enough for the input methods that I use. When rendering the line that contains the cursor we set up a little array of termchars that contains the pre-edit text and work out where it should be displayed. Then when rendering the screen we switch between displaying text from the real terminal and from the pre-edit string as necessary. Ideally, we should support longer strings, combining characters, and setting attributes. I think the current architecture should make all of those possible, but not entirely easy.