Utils: Show hidden directories in non-native file dialog by default

Selecting .ssh/*.pub is tricky otherwise.

Change-Id: Icd26ec7e4bb6fbb348d62fe6f4a629ea2e723706
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/libs/utils/fileutils.cpp

@@ -440,6 +440,7 @@ void prepareNonNativeDialog(QFileDialog &dialog)
 
         dialog.setSidebarUrls(Utils::transform(sideBarPaths, filePathToQUrl));
         dialog.setIconProvider(Utils::FileIconProvider::iconProvider());
+        dialog.setFilter(QDir::Hidden | dialog.filter());
     }
 }