Try to avoid dirty writes when crash while saving project file #3888
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I expect this to mitigate dirty writes caused by XML build failures, although it is not sufficient for disk errors unless further safe writing methods are implemented, such as .tmp file and moving.
I encountered a crash issue (due to a detached attached database via execute SQL command) in version 3.13.1, which led to the loss of the project file, although I am unable to reproduce the crash on the master branch (this seem fixed by #3662 (comment)).