On send, pull data from target edit if sending edit

ts/model-types.d.ts

@@ -113,6 +113,8 @@ export type MessageReactionType = {
   isSentByConversationId?: Record<string, boolean>;
 };
 
+// Note: when adding to the set of things that can change via edits, sendNormalMessage.ts
+//   needs more usage of get/setPropForTimestamp.
 export type EditHistoryType = {
   attachments?: Array<AttachmentType>;
   body?: string;