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There is no "view" in the editor. The only way to get the editor to display hidden characters is to actually replace the hidden characters with whatever symbolic character you need. At that point you have to keep track of every such replacement, so you can undo them when saving the text.
Or re-implement the entire QPlainTextEdit control from scratch to support a special rendering mode for non-visible characters.
One hackish way that you *may* be able to achieve this is to use a special font that has a symbol glyph for hidden characters. However, that will only work if Qt text layout engine allows the font to determine the rendering of non-visible characters, which may not be the case.
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