Gets the default size of the window.
A value of 0 for the width or height indicates that a default size has not been explicitly set for that dimension, so the “natural” size of the window will be used.
This function is the recommended way for [saving window state across restarts of applications](https://developer.gnome.org/documentation/tutorials/save-state.html).
location to store the default width
location to store the default height
Gets the default size of the window.
A value of 0 for the width or height indicates that a default size has not been explicitly set for that dimension, so the “natural” size of the window will be used.
This function is the recommended way for [saving window state across restarts of applications](https://developer.gnome.org/documentation/tutorials/save-state.html).