Sets the width of GTK_TEXT_WINDOW_LEFT or GTK_TEXT_WINDOW_RIGHT,
or the height of GTK_TEXT_WINDOW_TOP or GTK_TEXT_WINDOW_BOTTOM.
Automatically destroys the corresponding window if the size is set
to 0, and creates the window if the size is set to non-zero. This
function can only be used for the "border windows," it doesn't work
with GTK_TEXT_WINDOW_WIDGET, GTK_TEXT_WINDOW_TEXT, or
GTK_TEXT_WINDOW_PRIVATE.
Sets the width of GTK_TEXT_WINDOW_LEFT or GTK_TEXT_WINDOW_RIGHT, or the height of GTK_TEXT_WINDOW_TOP or GTK_TEXT_WINDOW_BOTTOM. Automatically destroys the corresponding window if the size is set to 0, and creates the window if the size is set to non-zero. This function can only be used for the "border windows," it doesn't work with GTK_TEXT_WINDOW_WIDGET, GTK_TEXT_WINDOW_TEXT, or GTK_TEXT_WINDOW_PRIVATE.