devtools

e3d1e12f - Add `JsonViewer` widget and update formatting / highlighting of `ExpandableVariable` (#4167)

Add `JsonViewer` widget and update formatting / highlighting of `ExpandableVariable` (#4167) Add `JsonViewer` widget and update formatting / highlighting of `ExpandableVariable` The `JsonViewer` widget wraps `ExpandableVariable`, displaying a tree of fake VM service `Instance`s built from a JSON object. These fake `Instance`s are stored in an instance of `JsonToServiceCache`, which implements `getObject(...)`, allowing for calls to `serviceManager.service.getObject(...)` to first check against the cache before speaking to the VM service. This change also modifies the `ExpandableVariable` widget structure to condense `Map` entries into a single row, and also introduces some syntax highlighting.