Import XaoS r489 (trunk after version 3.5)

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+.. _wait:
+
+.. index:
+   pair: command; wait
+
+Wait for complete image
+=======================
+
+**Syntax**:(wait)
+
+Wait until the image is complete. You should always use this function after
+zooming or unzooming when dynamic resolution is in use. This ensures that the
+image calculation will be complete so the user can see the result before the
+animation continues. It may also be useful in combination with filters like
+:ref:`motion blur <blur>`.
+
+This function deadlocks if used with :ref:`animation functions <animf>`; don't
+do that.
+
+**Available as**: command