Changing @auto paths overwrites files without warning

[tbnorth]

I loaded an outline with @auto nodes pointing to an out of date path. So body texts were empty. I updated the paths in the node headlines and saved the file, expecting to be prompted for overwriting the existing files (now the paths were correct again), but they were over-written with the blank content without warning. Damn. Steps to reproduce in a simpler way below, but don't write the below of as contrived, because the above is the real problem.

Create @auto /home/tbrown/text.txt

enter text, save file

Edit headline to @auto /home/tbrown/Desktop/text.txt

enter text, save file

Edit headline back to /home/tbrown/text.txt

Save file - /home/tbrown/text.txt is overwritten without warning

[tbnorth (terry-n-brown)]

I now see this happens also if the path change is in a @path node ancestor of the @auto node.

[Matt Wilkie (maphew)]

also see http://groups.google.com/group/leo-editor/browse_frm/thread/1e5d18b08269fb2a, which is about how to safely move or update a leo document using @file nodes (meaning: tread with care, it's easy to lose your date).

[HansBKK (hansbkk)]

discussion:
https://groups.google.com/forum/#!topic/leo-editor/i_wZXbk7R-c

[Edward K. Ream (edreamleo)]

Fixed (mostly) at rev 4921. I'll add some additional checks next.

[Edward K. Ream (edreamleo)]

Last fix at rev 4925.