Track linked extensions in extension manager #275
Merged
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This logic is missing in #248, so I've added it here.
The
linked_extension
property tracks if an extension has already been initialized and linked to a ServerApp. It was originally added for nbclassic when handling the shimming of server extensions. (This missing logic hasn't caused any issues because nbclassic is appending extensions directly to the private property,_linked_extensions
).This missing public-facing property became an issue when drafting jpserver-extension-check. I want to use this property to verify that extensions are linked properly in those tests.