Draws line with the specified `PangoRenderer`.
This draws the glyph items that make up the line, as well as shapes, backgrounds and lines that are specified by the attributes of those items.
| this |
a `PangoRenderer` |
| line |
a `PangoLayoutLine` |
| x |
X position of left edge of baseline, in user space coordinates in Pango units. |
| y |
Y position of left edge of baseline, in user space coordinates in Pango units. |