QFileDialog::HideNameFilterDetails breaks Cocoa QFileDIalog filter

Setting the QFileDialog::HideNameFilterDetails option on a QFileDIalog prevents the Cocoa QFileDialog from accepting files (this may affect other implementations as well).

QNSOpenSavePanelDelegate:shouldShowFilename is called by Cocoa to determine which file names should be accepted. This iterates over mSelectedNameFilter, passing each one to QDir::match to determine if they match.

However when QFileDialog::HideNameFilterDetails is set, file extensions have been stripped from mSelectedNameFilter and so no files ever match.

This can be seen by setting a filter of "Image Files (*.jpg)". mSelectedNameFilter will then contain two items ("Image" and "Files"), neither of which will match any of the files passed to shouldShowFilename.