It seems that due to the threaded nature, the limit to the number of open file handlers could be reached here. Or it could just be locked or something of course.
Fixes Sentry issue CURA-2V2.
Some ultimakers tend to choke if you try and send a lot of materials in one go.
Previously we would also always send the materials on the main thread, which would also make
the interface freeze a bit. That should no longer happen.
The implementation of this is not really great, but since this is a hotfix i've opted to change
as little as possible.
CURA-8224
This could happen because a material is deleted right at that moment, since the SendMaterialJob is done on a separate thread.
Fixes Sentry issue CURA-JZ.
The material manager is no longer populated so it wouldn't send any materials any more.
This is probably faster anyway since it doesn't need to go back to the container registry for every file.
Contributes to issue CURA-6600.
