QFileDialog::getSaveFileName() with DontUseNativeDialog returns string including wildcard

Steps:

1. Call QFileDialog::getSaveFileName() with DontUseNativeDialog flag as below

QFileDialog::getSaveFileName( NULL, "Save", ".", "*.txt", NULL, QFileDialog::DontUseNativeDialog );

2. Put characters which contains wildcard on file name field such as "a*"

3. Click "Save"

4. Return just "a*"

Expected: Filter by wildcard without return like Windows explorer.