Split out is_changing_upload from is_submitting (mastodon#9536)

There is no reason to disable the composer textarea when some media metadata
is being modified, nor is there any reason to focus the textarea when some
media metadata has been modified (prevents clicking one image's description
field right after having modified another).

app/javascript/mastodon/features/compose/components/compose_form.js

@@ -46,6 +46,7 @@ class ComposeForm extends ImmutablePureComponent {
     caretPosition: PropTypes.number,
     preselectDate: PropTypes.instanceOf(Date),
     is_submitting: PropTypes.bool,
+    is_changing_upload: PropTypes.bool,
     is_uploading: PropTypes.bool,
     onChange: PropTypes.func.isRequired,
     onSubmit: PropTypes.func.isRequired,
@@ -81,10 +82,10 @@ class ComposeForm extends ImmutablePureComponent {
     }
 
     // Submit disabled:
-    const { is_submitting, is_uploading, anyMedia } = this.props;
+    const { is_submitting, is_changing_upload, is_uploading, anyMedia } = this.props;
     const fulltext = [this.props.spoiler_text, countableText(this.props.text)].join('');
 
-    if (is_submitting || is_uploading || length(fulltext) > 500 || (fulltext.length !== 0 && fulltext.trim().length === 0 && !anyMedia)) {
+    if (is_submitting || is_uploading || is_changing_upload || length(fulltext) > 500 || (fulltext.length !== 0 && fulltext.trim().length === 0 && !anyMedia)) {
       return;
     }
 
@@ -160,7 +161,7 @@ class ComposeForm extends ImmutablePureComponent {
     const { intl, onPaste, showSearch, anyMedia } = this.props;
     const disabled = this.props.is_submitting;
     const text     = [this.props.spoiler_text, countableText(this.props.text)].join('');
-    const disabledButton = disabled || this.props.is_uploading || length(text) > 500 || (text.length !== 0 && text.trim().length === 0 && !anyMedia);
+    const disabledButton = disabled || this.props.is_uploading || this.props.is_changing_upload || length(text) > 500 || (text.length !== 0 && text.trim().length === 0 && !anyMedia);
     let publishText = '';
 
     if (this.props.privacy === 'private' || this.props.privacy === 'direct') {

app/javascript/mastodon/features/compose/containers/compose_form_container.js

@@ -22,6 +22,7 @@ const mapStateToProps = state => ({
   caretPosition: state.getIn(['compose', 'caretPosition']),
   preselectDate: state.getIn(['compose', 'preselectDate']),
   is_submitting: state.getIn(['compose', 'is_submitting']),
+  is_changing_upload: state.getIn(['compose', 'is_changing_upload']),
   is_uploading: state.getIn(['compose', 'is_uploading']),
   showSearch: state.getIn(['search', 'submitted']) && !state.getIn(['search', 'hidden']),
   anyMedia: state.getIn(['compose', 'media_attachments']).size > 0,

app/javascript/mastodon/reducers/compose.js

@@ -51,6 +51,7 @@ const initialState = ImmutableMap({
   in_reply_to: null,
   is_composing: false,
   is_submitting: false,
+  is_changing_upload: false,
   is_uploading: false,
   progress: 0,
   media_attachments: ImmutableList(),
@@ -79,6 +80,7 @@ function clearAll(state) {
     map.set('spoiler', false);
     map.set('spoiler_text', '');
     map.set('is_submitting', false);
+    map.set('is_changing_upload', false);
     map.set('in_reply_to', null);
     map.set('privacy', state.get('default_privacy'));
     map.set('sensitive', false);
@@ -248,13 +250,15 @@ export default function compose(state = initialState, action) {
       map.set('idempotencyKey', uuid());
     });
   case COMPOSE_SUBMIT_REQUEST:
-  case COMPOSE_UPLOAD_CHANGE_REQUEST:
     return state.set('is_submitting', true);
+  case COMPOSE_UPLOAD_CHANGE_REQUEST:
+    return state.set('is_changing_upload', true);
   case COMPOSE_SUBMIT_SUCCESS:
     return clearAll(state);
   case COMPOSE_SUBMIT_FAIL:
-  case COMPOSE_UPLOAD_CHANGE_FAIL:
     return state.set('is_submitting', false);
+  case COMPOSE_UPLOAD_CHANGE_FAIL:
+    return state.set('is_changing_upload', false);
   case COMPOSE_UPLOAD_REQUEST:
     return state.set('is_uploading', true);
   case COMPOSE_UPLOAD_SUCCESS:
@@ -300,7 +304,7 @@ export default function compose(state = initialState, action) {
     return insertEmoji(state, action.position, action.emoji, action.needsSpace);
   case COMPOSE_UPLOAD_CHANGE_SUCCESS:
     return state
-      .set('is_submitting', false)
+      .set('is_changing_upload', false)
       .update('media_attachments', list => list.map(item => {
         if (item.get('id') === action.media.id) {
           return fromJS(action.media);