Add user notes on accounts (#14148)

* Add UserNote model

* Add UI for user notes

* Put comment in relationships entity

* Add API to create user notes

* Copy user notes to new account when receiving a Move activity

* Address some of the review remarks

* Replace modal by inline edition

* Please CodeClimate

* Button design changes

* Change design again

* Cancel note edition when pressing Escape

* Fixes

* Tweak design again

* Move “Add note” item, and allow users to add notes to themselves

* Rename UserNote into AccountNote, rename “comment” Relationship attribute to “note”

app/javascript/mastodon/actions/account_notes.js

@@ -0,0 +1,69 @@
+import api from '../api';
+
+export const ACCOUNT_NOTE_SUBMIT_REQUEST = 'ACCOUNT_NOTE_SUBMIT_REQUEST';
+export const ACCOUNT_NOTE_SUBMIT_SUCCESS = 'ACCOUNT_NOTE_SUBMIT_SUCCESS';
+export const ACCOUNT_NOTE_SUBMIT_FAIL    = 'ACCOUNT_NOTE_SUBMIT_FAIL';
+
+export const ACCOUNT_NOTE_INIT_EDIT = 'ACCOUNT_NOTE_INIT_EDIT';
+export const ACCOUNT_NOTE_CANCEL    = 'ACCOUNT_NOTE_CANCEL';
+
+export const ACCOUNT_NOTE_CHANGE_COMMENT = 'ACCOUNT_NOTE_CHANGE_COMMENT';
+
+export function submitAccountNote() {
+  return (dispatch, getState) => {
+    dispatch(submitAccountNoteRequest());
+
+    const id = getState().getIn(['account_notes', 'edit', 'account_id']);
+
+    api(getState).post(`/api/v1/accounts/${id}/note`, {
+      comment: getState().getIn(['account_notes', 'edit', 'comment']),
+    }).then(response => {
+      dispatch(submitAccountNoteSuccess(response.data));
+    }).catch(error => dispatch(submitAccountNoteFail(error)));
+  };
+};
+
+export function submitAccountNoteRequest() {
+  return {
+    type: ACCOUNT_NOTE_SUBMIT_REQUEST,
+  };
+};
+
+export function submitAccountNoteSuccess(relationship) {
+  return {
+    type: ACCOUNT_NOTE_SUBMIT_SUCCESS,
+    relationship,
+  };
+};
+
+export function submitAccountNoteFail(error) {
+  return {
+    type: ACCOUNT_NOTE_SUBMIT_FAIL,
+    error,
+  };
+};
+
+export function initEditAccountNote(account) {
+  return (dispatch, getState) => {
+    const comment = getState().getIn(['relationships', account.get('id'), 'note']);
+
+    dispatch({
+      type: ACCOUNT_NOTE_INIT_EDIT,
+      account,
+      comment,
+    });
+  };
+};
+
+export function cancelAccountNote() {
+  return {
+    type: ACCOUNT_NOTE_CANCEL,
+  };
+};
+
+export function changeAccountNoteComment(comment) {
+  return {
+    type: ACCOUNT_NOTE_CHANGE_COMMENT,
+    comment,
+  };
+};