[emacs mode] Track activity after changes
[emacs mode] Track activity after changes

Fixes #786

emacsmirror/tern,fileability/tern,neoclide/tern,marijnh/tern,fileability/tern,ternjs/tern,othree/tern,neoclide/tern,marijnh/tern,marijnh/tern,MarcelGerber/tern,fileability/tern,emacsmirror/tern,MarcelGerber/tern,othree/tern,ternjs/tern,othree/tern,ternjs/tern,MarcelGerber/tern,emacsmirror/tern,neoclide/tern