The "Reset Highlighter" option in the right click menu now just clears
all highlights, instead of what it was trying to do before. It looks
like it was supposed to reset the EOS characters/sentence indices to
their original state, perhaps as a way to undo the "Combine sentences"
option. However, the previous implementation was broken. The code from
the original "Reset Highlighter" has been fixed up and added as its own
menu item, "Reset sentence boundaries", although I'm not sure how useful
it is.