We want the same key bindings for cycling between windows, and between
panels and the desktop in Marco and Compiz, i.e.:
Cycle between windows <Alt>Tab
Cycle backward between windows <Shift><Alt>Tab
Cycle between panels and the desktop <Control><Alt><Tab>
Cycle backwards between panels and the desktop <Shift><Control><Alt><Tab>

diff -Naru compiz-0.8.16.1/metadata/switcher.xml.in compiz-0.8.16.1.new/metadata/switcher.xml.in
--- compiz-0.8.16.1/metadata/switcher.xml.in	2018-10-11 03:36:50.000000000 +0200
+++ compiz-0.8.16.1.new/metadata/switcher.xml.in	2018-12-13 16:41:09.567414457 +0100
@@ -32,7 +32,6 @@
 		<option name="next_all_key" type="key">
 		    <_short>Next window (All windows)</_short>
 		    <_long>Popup switcher if not visible and select next window out of all windows</_long>
-		    <default>&lt;Primary&gt;&lt;Alt&gt;Tab</default>
 		</option>
 		<option name="prev_all_button" type="button">
 		    <_short>Prev window (All windows)</_short>
@@ -41,7 +40,6 @@
 		<option name="prev_all_key" type="key">
 		    <_short>Prev window (All windows)</_short>
 		    <_long>Popup switcher if not visible and select previous window out of all windows</_long>
-		    <default>&lt;Shift&gt;&lt;Primary&gt;&lt;Alt&gt;Tab</default>
 		</option>
 		<option name="next_no_popup_button" type="button">
 		    <_short>Next window (No popup)</_short>
@@ -66,6 +64,7 @@
 		<option name="next_panel_key" type="key">
 		    <_short>Next Panel</_short>
 		    <_long>Select next panel type window.</_long>
+		    <default>&lt;Control&gt;&lt;Primary&gt;&lt;Alt&gt;Tab</default>
 		</option>
 		<option name="prev_panel_button" type="button">
 		    <_short>Prev Panel</_short>
@@ -74,6 +73,7 @@
 		<option name="prev_panel_key" type="key">
 		    <_short>Prev Panel</_short>
 		    <_long>Select previous panel type window.</_long>
+		    <default>&lt;Shift&gt;&lt;Control&gt;&lt;Primary&gt;&lt;Alt&gt;Tab</default>
 		</option>
 	    </group>
 	</display>