Fix web UI allowing uploads past status limit via drag & drop (#11863)

Fix #11659

app/javascript/mastodon/features/ui/index.js

@@ -66,6 +66,7 @@ const mapStateToProps = state => ({
   isComposing: state.getIn(['compose', 'is_composing']),
   hasComposingText: state.getIn(['compose', 'text']).trim().length !== 0,
   hasMediaAttachments: state.getIn(['compose', 'media_attachments']).size > 0,
+  canUploadMore: !state.getIn(['compose', 'media_attachments']).some(x => ['audio', 'video'].includes(x.get('type'))) && state.getIn(['compose', 'media_attachments']).size < 4,
   dropdownMenuIsOpen: state.getIn(['dropdown_menu', 'openId']) !== null,
 });
 
@@ -232,6 +233,7 @@ class UI extends React.PureComponent {
     isComposing: PropTypes.bool,
     hasComposingText: PropTypes.bool,
     hasMediaAttachments: PropTypes.bool,
+    canUploadMore: PropTypes.bool,
     location: PropTypes.object,
     intl: PropTypes.object.isRequired,
     dropdownMenuIsOpen: PropTypes.bool,
@@ -278,13 +280,14 @@ class UI extends React.PureComponent {
       this.dragTargets.push(e.target);
     }
 
-    if (e.dataTransfer && Array.from(e.dataTransfer.types).includes('Files')) {
+    if (e.dataTransfer && Array.from(e.dataTransfer.types).includes('Files') && this.props.canUploadMore) {
       this.setState({ draggingOver: true });
     }
   }
 
   handleDragOver = (e) => {
     if (this.dataTransferIsText(e.dataTransfer)) return false;
+
     e.preventDefault();
     e.stopPropagation();
 
@@ -299,12 +302,13 @@ class UI extends React.PureComponent {
 
   handleDrop = (e) => {
     if (this.dataTransferIsText(e.dataTransfer)) return;
+
     e.preventDefault();
 
     this.setState({ draggingOver: false });
     this.dragTargets = [];
 
-    if (e.dataTransfer && e.dataTransfer.files.length >= 1) {
+    if (e.dataTransfer && e.dataTransfer.files.length >= 1 && this.props.canUploadMore) {
       this.props.dispatch(uploadCompose(e.dataTransfer.files));
     }
   }