Treat failed save actions as cancel actions. #146
Merged
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Previously, if the user exited the file browser dialog without saving the file (voluntarily, or due to I/O error), DME would still exit (or wipe out the watch model; depending on the case), causing unrecoverable data loss.
Test plan:
Previous behavior: The watch list was wrongly cleared, without the user having saved it.
New behavior: The user gets back to DME, as if Cancel had been selected in the confirmation dialog.