autosave: don't save unmodified buffer #3356
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Saving a buffer every time without even checking if it was modified (i.e. even when the user is not editing the buffer) is wasteful, especially if the autosave period is set to a short value.
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Saving a buffer every time without even checking if it was modified (i.e. even when the user is not editing the buffer) is wasteful, especially if the autosave period is set to a short value.