This is a PopoverButton that has an autopause.Entry set as the child. I
also override the displayed icon to show the current autopause count.
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>
This entry is inspired by the Gtk.SpinButton, but lets us set
placeholder text to display the current autopause value to the user.
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>