Auto Draft database insertion overflow

[Zatsugami]

When you just visit Posts > Add new a draft is inserted into database.
If you leave the page without doing anything the entry remains unused and is inaccessible. This leads to a great number of trash database entries.
You can just hit refresh few times and you end up with several auto drafts. This is obviously a weird behavior which I consider as a bug.
Also, the save_post action is called because of that which is misleading when you think about process of data insertion.
Even just after fresh install there are 2 drafts already in database!?

[nacin]

These are cleaned up after one week.

When we made the switch to auto-drafts in 3.0, no one really commented on save_post being triggered. Indeed, it triggers in a number of other situations, such as Quick Edit.

For more, #18800.