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No, QPlainTextEdit does not expose detailed change information. You know when the text changes, not exactly what the change was. And in any case maintaing two copies of the text that would need to be synchronized would double memory consumption and be very slow.
The only workable solution is for this is to change the rendering code to simply render invisible characters visibily. But that requires modifying the guts of Qt's text rendering system and is waaaay too much work.
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