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3bb04245c5
... Strong, meaning that the file at the specified path is created or modified only if all write operations complete without exceptions, barring one very unlikely possibility that a final file rename fails, but even in that case the output is successfully written to some path. This commit does not add throws, but changes the type thrown to a subclass of AudacityException, so that GuardedCall will cause the user to see an error dialog in all cases. Duplicated logic for making temporary files and backups is now all in one place, the class XMLWriter. There may be more new GuardedCalls than necessary -- the catch-all for the event loop, AudacityApp::OnExceptionInMainLoop, might be trusted instead in some cases -- but they are sufficient.