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qelectrotech-source-mirror/sources
ispyisail 745b4a936c Fix bugtracker #273: skip crash-recovery backups of an unchanged project
writeBackup() rebuilds the whole project's XML with toXml() on the GUI
thread before handing the file write to a worker thread. On a big project
that freezes the interface for seconds (bugtracker #273, and #329, where
the interval was raised from 2 to 20 minutes to make it rarer). It ran
right after every project was opened, and then every 20 minutes whether
or not anything had changed.

Only write a backup when something changed since the last one: the undo
stack moved, setModified(true) was called, or the embedded element or
title block collections changed. A project just opened from a file starts
clean, since the file is already what a crash would restore. New projects
and projects restored from a backup are backed up at once, as before.

Measured on examples/industrial.qet (50 folios), each backup blocks the
GUI thread for about 0.28 s on a fast machine; with a 2 s test interval,
the old code backed up on every tick, the new code only after a change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-24 21:57:42 +12:00
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