Changes in query editor are mysteriously undone while editing (Postico 2)

A customer has reported an issue (Feedback 557) where changes in the query editor disappear while editing SQL queries.

In one instance, text that the user entered disappeared shortly after entering the text. Using Cmd-Z restored the text.

In another instance, the user deleted a query file in the sidebar, only to have it reappear a short while later.

It looks like either a background process in Postico is writing old versions of the file to disk, or Postico is reloading the file unexpectedly.

Start in Postico's query editor and sidebar by reproducing both the disappearing text and the reappearing deleted query. Trace the background file-writing and reload behavior described in the issue; done means edits remain intact and deleted query files do not return unexpectedly.

Written by the indexing model from the issue text.