The snapshot_layer vfunc is called before and after the text
view is drawing its own text. Applications can override this vfunc
in a subclass to draw customized content underneath or above the
text. In the gtk.types.TextViewLayer.BelowText and gtk.types.TextViewLayer.AboveText
layers the drawing is done in the buffer coordinate space.
The snapshot_layer vfunc is called before and after the text view is drawing its own text. Applications can override this vfunc in a subclass to draw customized content underneath or above the text. In the gtk.types.TextViewLayer.BelowText and gtk.types.TextViewLayer.AboveText layers the drawing is done in the buffer coordinate space.