I have found out that, in Slidex, the printed data cannot be queried at the time when it is sending data to the printer.
Because the printing task is on a different thread. This means that some other threads might already change the data in the database.
It makes the printed data wrong.
Here is the fix:
We need to make copies of all data needed by a printing task. And that's it.
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This also happens with all the commanders. We need to make copies of data just for sending.
