Returns the fallback for this this.
The fallback will be used if this cursor is not available on a given `GdkDisplay`. For named cursors, this can happen when using nonstandard names or when using an incomplete cursor theme. For textured cursors, this can happen when the texture is too large or when the `GdkDisplay` it is used on does not support textured cursors.
| this |
a `GdkCursor` |
|
the fallback of the cursor or null to use the default cursor as fallback |