[pacman-dev] installing two packages conflicting with each other

http://bugs.archlinux.org/task/7415#comment17206 I think this bug is not so obvious, there are two package in the same group, one conflicts / replaces / provides the other. There are at least 3 cases to consider here for the state before the installation : none of the packages are installed, old package is installed, new package is installed. Should pacman always choose the package replacing the other ? And what should happen without the replace flag, if the package only provides and conflicts with the other ?