Before this commit, when a .mount unit file is loaded, the device dependencies from the unit file are automatically added. If a device that is different from which specified in .mount unit file is mounted on the path, then the device dependencies about the device are also added. Hence, the unit has device dependencies about two (or more) different devices. Hence, if one of the devices are unplugged, even if another one is mounted on the path, then the path is unmounted. This commit makes device dependencies from two different sources exclusive, and always regenerate the dependencies when one of the information is updated. Fixes #19983 and #23552.
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