Fix @base not resolving in nested inner contexts

Author: elpoelma

lib/ContextParser.ts

@@ -617,14 +617,14 @@ must be one of ${Util.CONTAINERS.join(', ')}`, ERROR_CODES.INVALID_CONTAINER_MAP
               parentContext[key] = {...parentContext[key]};
               delete parentContext[key]['@context'];
               await this.parse(value['@context'],
-                { ...options, parentContext, ignoreProtection: true, ignoreRemoteScopedContexts: true, ignoreScopedContexts: true });
+                { ...options, external: false, parentContext, ignoreProtection: true, ignoreRemoteScopedContexts: true, ignoreScopedContexts: true });
             } catch (e) {
               throw new ErrorCoded(e.message, ERROR_CODES.INVALID_SCOPED_CONTEXT);
             }
           }
 
           value['@context'] = (await this.parse(value['@context'],
-            { ...options, minimalProcessing: true, ignoreRemoteScopedContexts: true, parentContext: context }))
+            { ...options, external: false, minimalProcessing: true, ignoreRemoteScopedContexts: true, parentContext: context }))
             .getContextRaw();
         }
       }

test/ContextParser-test.ts

@@ -1688,6 +1688,8 @@ Tried mapping @id to {}`, ERROR_CODES.KEYWORD_REDEFINITION));
           .resolves.toEqual(new JsonLdContextNormalized({
             prop: {
               '@context': {
+                "@__baseDocument": true,
+                "@base": "http://example.org/remote_cyclic_scoped_indirect_1.jsonld",
                 prop: {
                   '@context': 'http://example.org/remote_cyclic_scoped_indirect_1.jsonld',
                   '@id': 'ex:prop',
@@ -1927,6 +1929,8 @@ Tried mapping @id to {}`, ERROR_CODES.KEYWORD_REDEFINITION));
           .resolves.toEqual(new JsonLdContextNormalized({
             prop: {
               '@context': {
+                "@__baseDocument": true,
+                "@base": "http://example.org/remote_cyclic_scoped_indirect_1.jsonld",
                 prop: {
                   '@context': 'http://example.org/remote_cyclic_scoped_indirect_1.jsonld',
                   '@id': 'ex:prop',