Obtains the current set of [class@InputCaptureZone] objects.
The returned object is valid until the zones are invalidated by the [signal@InputCaptureSession:
XdpInputCaptureSession:zones-changed] signal.
Unless the session is active, this function returns `NULL`.
| this |
a [class@InputCaptureSession] |
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the available zones. The caller must keep a reference to the list or the elements if used outside the immediate scope. |