fix:事项来源优化，定时器评价优化

xusd

9 days ago 6bde2de72d9e16a7fc1ee204149effb47d9676d9

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<span ng-if="property.value.expression.type != 'variables' && property.value.expression.staticValue">{{property.value.expression.staticValue|limitTo:20}}</span>
<span ng-if="property.value && !property.value.expression">{{property.value|limitTo:20}}</span>
<span ng-if="!property.value">{{'PROPERTY.SEQUENCEFLOW.CONDITION.NO-CONDITION-DISPLAY' | translate}}</span>