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That is just a python interface to an existing Qt class to help find word boundaries and etc based on unicode character classes.
As it stands, since Calibre's editor is successful using the NFC approach, we should be able to accomplish the same with enough redesign. The source and find fields will all use the same Unicode normalization forms so they will just work. The days of removing accents just to search for pseudo text are long gone.
Our use_nfc branch is undergoing testing now. When it is stable we will make a Beta release for people to test with, and report back any issue.
Once we get that working, I will eventually add a simple application level variable controlled by an environment variable that will determine whether to run the conversion to NFC form at all.
If we can *not* get things to work as we want, then we will move to creating a Sigil tool to run NFC normalization for the entire book, but that is just a fallback plan.
Over the last 5 years a typical Sigil release typically involves 40 thousand to 80 thousand Windows downloads, and 10 thousand to 20 thousand Mac OS downloads plus uncounted additional downloads on Linux, Mac Ports, Homebrew, and other places.
So over 100,000 regular users who bother to download multiple releases of Sigil. With that dedicated user base and a long enough beta testing period, we should be able to track down and fix any remaining issues.
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