fix: File upload input must stopPropagation of click events otherwise click event is triggered on sidebar menu item and file choose dialog never appears

closes #1065

app/menus/CollectionMenu.js

@@ -99,6 +99,7 @@ class CollectionMenu extends React.Component<Props> {
             type="file"
             ref={ref => (this.file = ref)}
             onChange={this.onFilePicked}
+            onClick={ev => ev.stopPropagation()}
             accept="text/markdown, text/plain"
           />
         </VisuallyHidden>