Tests if the point at (x, y) is contained in this.
The coordinates for (x, y) must be in widget coordinates, so (0, 0) is assumed to be the top left of
this's content area.
| this |
the widget to query |
| x |
X coordinate to test, relative to this's origin |
| y |
Y coordinate to test, relative to this's origin |
|
true if this contains ( |