Use cached remote json schema in offline situations #1046
Description
Is your enhancement related to a problem? Please describe.
When editing a yaml files which uses a remote json schema, the schema is loaded and works well when I'm online.
However, during unstable uplinks or offline situations, I only get the error Unable to load schema from https://....
Describe the solution you would like
#878 describes that json schemas are cached locally. The local cache should be used in offline situations.
A warning could still be displayed, but with the additional hint that the cached version is used instead.
Describe alternatives you have considered
None.