QFileDialogOptions: Expose default name filter setting.

Move the bool QFileDialogPrivate::defaultFileTypes to QFileDialogOptions
as defaultNameFilters and add a static function returning the
translated default filter string. Let QFileDialogOptions::nameFilters()
return the default filter until a value has been set.

This removes the need for special handling for empty filter lists
in the QPA plugins. As a side effect, Qt Quick Controls's FileDialog
will then also default to "All files" if no filters have been set.

Task-number: QTBUG-50644
Change-Id: I9ba271a472d4fa03767b540ef6f1399f5ca4408e
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@theqtcompany.com>

0 files changed, 0 insertions, 0 deletions