Import XaoS r489 (trunk after version 3.5)

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diff --git a/help/rest/cycling.txt b/help/rest/cycling.txt
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+.. index::
+   pair: menu item; Color cycling
+   pair: command line option; cycling
+   pair: command; cycling
+   pair: menu item; Reversed color cycling
+   pair: command line option; rcycling
+   pair: command; rcycling
+   pair: menu item; Color cycling speed
+   pair: command; cyclingspeed
+   pair: command line option; cyclingspeed
+
+.. _cycling:
+.. _rcycling:
+.. _cyclingspeed:
+
+Color cycling
+=============
+
+**Syntax**:(cycling bool)
+
+Color cycling is an old and simple effect to animate fractals. The Mandelbrot
+set looks particularly nice when color-cycled. On truecolor displays, color
+cycling fails to initialize (since those displays don't have a palette). You
+can enable :ref:`palette emulation filter <palettef>` to make it possible.
+
+**Available as**: menu item, command line option, command
+
+In the user interface, colors can also be cycled in the opposite direction with
+the "**Reversed color cycling**" function.
+
+To control the cycling speed, you coan use arrow keys or the "**Color cycling
+speed**" function.
+
+**Available as**: menu item
+
+**Syntax**:(cyclingspeed integer)
+
+The parameter specifies the number of skips per second. It can be negative to
+cycle in the opposite direction.
+
+**Available as**: menu item, command line option, command