State of the "Create new folder"-Button in QFileDialog

When using QFileDialog::getOpenFileName() and navigating to a directory without write permissions, then the state of the "Create new folder" button is still enabled. When pressing the button, nothing happens. The button should be disabled in this case.

Reproduced on Windows using the standarddialogs example from qtdir/examples/dialogs.
Steps to reproduce:

• Use a user without admin rights
• Uncheck the "use native dialog" checkbox
• Select getOpenFileName() button
• Navigate to a directory where you have no write permissions
• The "Create new folder" button is enabled and can be clicked, but nothing happens when clicking it. It should have been disabled.