Using a list ensures that all subprocess arguments are correctly
escaped. By building strings and then calling .split(), potential
arguments with a space will be incorrectly split over two arguments.
When a string is needed for presentation, join to the list to build the
string.
* flatpak: Change use of Popen to module.run_command()
* Update changelogs/fragments/274-flatpak-run-command.yaml
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Felix Fontein <felix@fontein.de>