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$runs some special command in AucTeX, and that command isn't marked to as an insertion command, see delsel.el commentary(put 'TeX-insert-dollar 'delete-selection t)TeX-electric-mode?TeX-insert-dollarwasn't missed, it's so by design because for the features it provides the function needs to keep alive the current selectionTeX-insert-dollarhad in the past thedelete-selectionproperty, but it was removed in order to provide the feature mentioned above: git.savannah.gnu.org/cgit/auctex.git/commit/…