[eschwartz]

See here: https://www.mobileread.com/forums/sho...d.php?t=234044

Originally Posted by kovidgoyal

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.

Originally Posted by kovidgoyal

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.