qt5-flatpak-platformtheme 5.11.1+dfsg-3ubuntu1 (arm64 binary) in ubuntu cosmic

 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 This package provides the Flatpak platform theme, which makes Qt use
 native file dialogs on Flatpak-based environments.