Add Array/property length in JSON code fold widget #1861
Merged
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Closes #1799.
As per title, notes are in the issue 馃槃
The code being used is the same as used by the code-folding example in CodeMirror docs, which I added and was reviewed by the maintainer of CodeMirror. On his suggestion, the changes to the core library were minimal (allow for the widget to be a callback), with the actual logic to be defined by consumers.