Add TextField for filename in FileDialog

The non-native fileDialog works well for selecting existing files.

But if the user wants to select non-existing files, the only way to do that currently is to press Ctrl+L (which isn't documented).
Pressing Ctrl+L will transform the FolderBreadcrumbBar into a TextField, which lets the user write down the URL that he wishes to select. This isn't very intuitive.

Most File Dialogs have a TextField that contains the file name of the selected file.

It seems to be quite common for file dialogs to have a FolderBreadcrumbBar which lets the user see what the "current directory" is. A ListView with all the files inside of the "current directory", and 2 TextFields. One which contains the filename of the selected file inside of the "current directory", and another textfield (or I guess rather a combobox) for selecting the filter.

The current file dialog has most of those features, but it doesn't have a text field for the selected file inside of the "current directory".