Fix upload file input being re-rendered needlessly

app/assets/javascripts/components/features/compose/components/upload_button.jsx

@@ -12,7 +12,8 @@ const UploadButton = React.createClass({
     disabled: React.PropTypes.bool,
     onSelectFile: React.PropTypes.func.isRequired,
     style: React.PropTypes.object,
-    key: React.PropTypes.number
+    resetFileKey: React.PropTypes.number,
+    intl: React.PropTypes.object.isRequired
   },
 
   mixins: [PureRenderMixin],
@@ -32,12 +33,12 @@ const UploadButton = React.createClass({
   },
 
   render () {
-    const { intl } = this.props;
+    const { intl, resetFileKey, disabled } = this.props;
 
     return (
       <div style={this.props.style}>
-        <IconButton icon='photo' title={intl.formatMessage(messages.upload)} disabled={this.props.disabled} onClick={this.handleClick} size={24} />
-        <input key={this.props.key} ref={this.setRef} type='file' multiple={false} onChange={this.handleChange} disabled={this.props.disabled} style={{ display: 'none' }} />
+        <IconButton icon='photo' title={intl.formatMessage(messages.upload)} disabled={disabled} onClick={this.handleClick} size={24} />
+        <input key={resetFileKey} ref={this.setRef} type='file' multiple={false} onChange={this.handleChange} disabled={disabled} style={{ display: 'none' }} />
       </div>
     );
   }

app/assets/javascripts/components/features/compose/containers/upload_button_container.jsx

@@ -4,7 +4,7 @@ import { uploadCompose } from '../../../actions/compose';
 
 const mapStateToProps = state => ({
   disabled: state.getIn(['compose', 'is_uploading']) || (state.getIn(['compose', 'media_attachments']).size > 3 || state.getIn(['compose', 'media_attachments']).some(m => m.get('type') === 'video')),
-  key: Math.floor((Math.random() * 0x10000))
+  resetFileKey: state.getIn(['compose', 'resetFileKey'])
 });
 
 const mapDispatchToProps = dispatch => ({

app/assets/javascripts/components/reducers/compose.jsx

@@ -38,7 +38,8 @@ const initialState = Immutable.Map({
   media_attachments: Immutable.List(),
   suggestion_token: null,
   suggestions: Immutable.List(),
-  me: null
+  me: null,
+  resetFileKey: Math.floor((Math.random() * 0x10000))
 });
 
 function statusToTextMentions(state, status) {
@@ -65,6 +66,7 @@ function appendMedia(state, media) {
   return state.withMutations(map => {
     map.update('media_attachments', list => list.push(media));
     map.set('is_uploading', false);
+    map.set('resetFileKey', Math.floor((Math.random() * 0x10000)));
     map.update('text', oldText => `${oldText} ${media.get('text_url')}`.trim());
   });
 };