Add safeguard to "Delete all completed" option
I have accidently deleted all completed tasks because it appears as an option when deleting one task or tree within an outline. There are severla ways to do,that:
- put in a question "are you sure?" Continue, Cancel.
- move " Delete all completed" option to another place, "Outline" options set.
- allow configuration setting to turn off this feature and/or force extra question to confirm delete.

Added in version 3.12
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Big Al commented
This undo is good. I didn't really notice it on the iPad initally but good to know now. There is "revert" in the online version, however, don't accidentally click off the project or it will save and I presume be too late to undo. These interfaces do need to be aligned in the way they are used.