- Electron version: 1.3.5
- Operating system: macOS/Windows

Alt-clicking a link is a default shortcut for downloading a file without a save prompt, and we make use of it in our app. But for links that end in a trailing slash, the resulting filename isn't consistent with the default file name in the save prompt.

The save prompt constructs a name from the word "download" and the extension for the mime type of the file, but the prompt-less savepath is just the domain name of the link. This leads to unusable files (e.g. with a .com file extension) being saved to the filesystem.

Here's my current workaround, but given the prompt does get a useful path, and Chrome behaves correctly, I imagine this might be straightforward to fix if you know where to look:

``` javascript
const mime = require('mime-types');
const _ = require('lodash');
const path = require('path');
const unusedFilename = require('unused-filename');

win.webContents.session.on('will-download', function (e, item, webContents) {
  if (item.getSavePath() && _.last(item.getURL()) === '/') {
      var savePath = unusedFilename.sync(path.format({
        dir: path.dirname(item.getSavePath()),
        name: 'download',
        ext: '.' + mime.extension(item.getMimeType())
      }));
      item.setSavePath(savePath);
    }
});
```

atom/browser/atom_download_manager_delegate.cc
if (relay)
    window = relay->window.get();
  base::FilePath path;
  GetItemSavePath(item, &path);
  
  if (path.empty() && file_dialog::ShowSaveDialog(window, item->GetURL().spec(),
                                                  "", default_path,
                                                  file_dialog::Filters(),
                                                  &path)) {
    
    AtomBrowserContext* browser_context = static_cast<AtomBrowserContext*>(
        download_manager_->GetBrowserContext());
    browser_context->prefs()->SetFilePath(prefs::kDownloadDefaultDirectory,
                                          path.DirName());
    v8::Isolate* isolate = v8::Isolate::GetCurrent();
    v8::Locker locker(isolate);
    v8::HandleScope handle_scope(isolate);
    api::DownloadItem* download_item = api::DownloadItem::FromWrappedClass(
        isolate, item);
    if (download_item)
      download_item->SetSavePath(path);
  }
  
  
  
  callback.Run(path,
               content::DownloadItem::TARGET_DISPOSITION_PROMPT,
               content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS, path);
}
void AtomDownloadManagerDelegate::Shutdown() {