- 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
weak_ptr_factory_.InvalidateWeakPtrs();
  download_manager_ = nullptr;
}
bool AtomDownloadManagerDelegate::DetermineDownloadTarget(
    content::DownloadItem* download,
    const content::DownloadTargetCallback& callback) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  if (!download->GetForcedFilePath().empty()) {
    callback.Run(download->GetForcedFilePath(),
                 content::DownloadItem::TARGET_DISPOSITION_OVERWRITE,
                 content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
                 download->GetForcedFilePath());
    return true;
  }
  
  base::FilePath save_path;
  GetItemSavePath(download, &save_path);
  if (!save_path.empty()) {
    callback.Run(save_path,
                 content::DownloadItem::TARGET_DISPOSITION_OVERWRITE,
                 content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
                 save_path);
    return true;
  }
  AtomBrowserContext* browser_context = static_cast<AtomBrowserContext*>(
      download_manager_->GetBrowserContext());