Sets the default size of a window. If the window's "natural" size (its
size request) is larger than the default, the default will be ignored.
more generally, if the default size does not obey the geometry hints for
the window (set_geometry_hints() can be used to set these explicitly), the
default size will be clamped to the nearest permitted size.
Unlike set_size_request(), which sets a size request for a widget and thus
would keep users from shrinking the window, this function only sets the
initial size, just as if the user had resized the window themselves. Users
can still shrink the window again as they normally would. Setting a
default size of -1 means to use the "natural" default size (the size
request of the window).
For more control over a window's initial size and how resizing works,
investigate set_geometry_hints().
For some uses, resize() is a more appropriate function. resize() changes
the current size of the window, rather than the size to be used on initial
display. resize() always affects the window itself, not the geometry
widget.
The default size of a window only affects the first time a window is shown;
if a window is hidden and re-shown, it will remember the size it had prior
to hiding, rather than using the default size.
Window scan't actually be 0x0 in size, they must be at least 1x1, but
passing 0 for width and height is OK, resulting in a 1x1 default size.