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Introduce a new config_set_in_gitmodules_file_gently() function to write config values to the .gitmodules file. This is in preparation for a future change which will use the function to write to the .gitmodules file in a more controlled way instead of using "git config -f .gitmodules". The purpose of the change is mainly to centralize the code that writes to the .gitmodules file to avoid some duplication. The naming follows git_config_set_in_file_gently() but the git_ prefix is removed to communicate that this is not a generic git-config API. Signed-off-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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