BZ-1077282 - Method size is changed when the guided rule is reopen

(cherry picked from commit b094623a3996bca30dac08a3a8d4fb5d5c1fb25c)

Conflicts:
	drools-workbench-models/drools-workbench-models-commons/src/test/java/org/drools/workbench/models/commons/backend/rule/RuleModelDRLPersistenceUnmarshallingTest.java