hold shift to add multiple extenions/sounds/costumes/etc

Author: ddededodediamante

src/components/library/library.jsx

@@ -82,7 +82,9 @@ class LibraryComponent extends React.Component {
         }
     }
     handleSelect (id) {
-        this.handleClose();
+        if (!this._lastClickWasShift) {
+            this.handleClose();
+        }
         this.props.onItemSelected(this.getFilteredData()[id]);
     }
     readFavoritesFromStorage () {
@@ -303,6 +305,7 @@ class LibraryComponent extends React.Component {
                         [styles.withFilterBar]: this.props.filterable || this.props.tags
                     })}
                     ref={this.setFilteredDataRef}
+                    onClickCapture={e => { this._lastClickWasShift = e.shiftKey; }}
                 >
                     {filteredData && this.getFilteredData().map((dataItem, index) => (
                         dataItem === '---' ? (
@@ -405,4 +408,4 @@ LibraryComponent.defaultProps = {
     showPlayButton: false
 };
 
-export default injectIntl(LibraryComponent);
+export default injectIntl(LibraryComponent);