Ghostkeeper 8346e465f6
Turn MaterialManagementModel into a singleton
Just like MaterialManager used to be. There can be only one instance of the page then.
This prevents a crash when Qt deletes the QObject because it's no longer used in the page when you close the preferences screen. But when you open it again it doesn't construct a new one. Now there is always one instance so that's not a problem any more. Also it allows other pages to access this item.

Contributes to issue CURA-6600.
2019-08-27 15:47:41 +02:00
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