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introduce "tree_rooted"

svg/tree_rooted.toml

@@ -0,0 +1,13 @@
+# If true, this indicates that the symbol should always have
+
+# a symbol nested within its nesting area(s).
+
+always_nest = false
+
+
+
+# If true, this indicates that the symbol should always
+
+# be nested inside another symbol's nesting area.
+
+always_be_nested = false