We want to keep it this way so people can still make plugins work for older versions of Cura, like 3.6, where the 'api' field with just a single major version, instead of the 'supported_sdk_versions', which can be either a version-string like '7.6.0' or a list of version strings.
The Cura 4.9 release will have expanded functionality. If you have a plug-in that uses this functionality, marking it as using SDK 7.5.0 will notify older Cura releases that they can't use that plug-in.
The code was moved to uranium, so no need to test them in a plugin.
In some cases they were also testing a specific implementation artifact and not
actual expected behavior.
CURA-7388
CURA-4188
Custom FDM printers in 2.5 don't have multi-extrusion support but they
do since 2.6. Upgrading from 2.5 to 2.6 will not create the missing
extruder stacks for the old custom FDM printers, which causes a crash.
This fix makes sure that all custom FDM printers will have 8 extruder
stacks during the upgrade so that Cura can still start normally and
those printers will still be usable.
CURA-3975
- Set Preferences setting_version in CuraApplication so Preferences can
get upgraded correctly
- Fix upgrade script for 2.5 to 2.6
- Fix upgrade script for 2.6 to 2.7 which relies on the upgrade of 2.5
to 2.6
