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Just as a follow-up: with PageEdit (or Sigil) 2.7.6, you can now unset preexisting environment variables (for only the PageEdit or Sigil process) by adding the following entry in the env-vars.txt file in the PageEdit/Sigil preferences folder:
~QTWEBENGINE_DICTIONARIES_PATH
Just a tilde and the environment variable name is enough to unset it.
That way you wouldn't have to risk messing with a system setting if you're unsure about it. Unsetting it that way will allow the AppImage to default back to its own included .bdic spellcheck dictionaries (while still allowing users to specify a custom location for those dictionaries if they want).
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