Commits on May 18, 2024

1. Treat failed save actions as cancel actions. …

   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:
   - Launch DME.
   - Add a few watch entries to mark the model with unsaved changes.
   - Clear the watch list via the **File > Clear the watch list** action.
   - A confirmation dialog with the **Cancel**, **No**, and **Yes** options
     should appear.
   - Click **Yes**
   - Once the file browser dialog opens, close it without selecting a file
     (or choose a filepath where the user does not have write permissions).
   
   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.

   

   cristian64 committed May 18, 2024
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