Add prefer-no-csd option

resources/default-config.kdl

@@ -56,6 +56,10 @@ focus-ring {
     inactive-color 0.3 0.3 0.3 1.0
 }
 
+// Uncomment this line to ask the clients to omit their client-side decorations if possible.
+// If the client will specifically ask for CSD, the request will be honored.
+// prefer-no-csd
+
 binds {
     // Keys consist of modifiers separated by + signs, followed by an XKB key name
     // in the end. To find an XKB name for a particular key, you may use a program