Warning
gtk_icon_source_set_size has been deprecated since version 3.10 and should not be used in newly-written code. Use GtkIconTheme instead.
Sets the icon size this icon source is intended to be used
with.
Setting the icon size on an icon source makes no difference
if the size is wildcarded. Therefore, you should usually
call gtk_icon_source_set_size_wildcarded() to un-wildcard it
in addition to calling this function.
Warning gtk_icon_source_set_size has been deprecated since version 3.10 and should not be used in newly-written code. Use GtkIconTheme instead. Sets the icon size this icon source is intended to be used with. Setting the icon size on an icon source makes no difference if the size is wildcarded. Therefore, you should usually call gtk_icon_source_set_size_wildcarded() to un-wildcard it in addition to calling this function.