Proposal for Issue facebookarchive#430

Sometimes, we do not want MUTABLE entities to be continued when they are on the left of
the cursor, for example when creating a LINK entity that we do not want to continue after
pressing the space key, this proposal adds a "Contiguous" setting set to true by default that
we can set to false to get the desired behavior

src/model/entity/DraftEntity.js

@@ -48,10 +48,11 @@ var DraftEntity = {
   create: function(
     type: DraftEntityType,
     mutability: DraftEntityMutability,
+    contiguous?: bool,
     data?: Object
   ): string {
     return DraftEntity.add(
-      new DraftEntityInstance({type, mutability, data: data || {}})
+      new DraftEntityInstance({type, mutability, contiguous: true, data: data || {}})
     );
   },
 

src/model/entity/DraftEntityInstance.js

@@ -41,6 +41,10 @@ class DraftEntityInstance extends DraftEntityInstanceRecord {
     return this.get('type');
   }
 
+  getContiguity(): DraftEntityMutability {
+    return this.get('contiguous');
+  }
+
   getMutability(): DraftEntityMutability {
     return this.get('mutability');
   }

src/model/entity/getEntityKeyForSelection.js

@@ -59,7 +59,7 @@ function filterKey(
 ): ?string {
   if (entityKey) {
     var entity = DraftEntity.get(entityKey);
-    return entity.getMutability() === 'MUTABLE' ? entityKey : null;
+    return (entity.getMutability() === 'MUTABLE' || entity.getContiguity()) ? entityKey : null;
   }
   return null;
 }