Draws a vertical line from (x, y1_) to (x, y2_) in cr using the given
style and state.
Use gtk_render_line instead
| style |
a Style |
| state_type |
a state |
| widget |
the widget |
| detail |
a style detail |
| y1_ |
the starting y coordinate |
| y2_ |
the ending y coordinate |
| x |
the x coordinate |
| cr |
a Context |