Places @widget into the gutter specified by @win.
@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
Places @widget into the gutter specified by @win.
@win must be one of %GTK_TEXT_WINDOW_LEFT, %GTK_TEXT_WINDOW_RIGHT, %GTK_TEXT_WINDOW_TOP, or %GTK_TEXT_WINDOW_BOTTOM.