Gets a GtkWidget that has previously been set as gutter.
See [method@Gtk.TextView.set_gutter].
@win must be one of %GTK_TEXT_WINDOW_LEFT, %GTK_TEXT_WINDOW_RIGHT, %GTK_TEXT_WINDOW_TOP, or %GTK_TEXT_WINDOW_BOTTOM.
a GtkTextWindowType
a GtkWidget or %NULL
See Implementation
Gets a GtkWidget that has previously been set as gutter.
See [method@Gtk.TextView.set_gutter].
@win must be one of %GTK_TEXT_WINDOW_LEFT, %GTK_TEXT_WINDOW_RIGHT, %GTK_TEXT_WINDOW_TOP, or %GTK_TEXT_WINDOW_BOTTOM.