I used this procedure :

git clone https://github.com/codemirror/CodeMirror.git --branch 5.13.4
cd CodeMirror

find . -not -path "./.git*" -type f -exec sed -i 's/addon\/edit\//addon\/cm_edit\//g' {} +
git mv addon/edit addon/cm_edit
git commit -a -m "ERP5: rename addon/edit -> addon/cm_edit"

lftp http://login:password@172.17.0.2:2200/erp5/portal_skins/erp5_code_mirror/ -e 'rm -rf codemirror ; mkdir codemirror ; quit' &&\
lftp http://login:password@172.17.0.2:2200/erp5/portal_skins/erp5_code_mirror/codemirror/ -e 'mkdir addon ; mput -d * */* */*/* */*/*/* ; quit '

(cherry picked from commit 639c0d5a)