[Feat]: How to implement the overflow prompt of the combo label text? (combo's label text is displayed beyond the width...) ） #6611

Describe the feature / 功能描述

If the combo text is too long, an ellipsis (ellipsis) is displayed when it exceeds a certain width. 1、使用label配置未生效。Currently, the labelCfgStyle configuration fails. style: { fill: '# 666', width: 100, overflow: 'hidden', textOverflow: 'ellipsis' } 2、Labels are customized based on rect. The label cannot be rewritten during document display. 基于rect类型自定义combos, 无法覆盖原有label, 官网原文：在 drawShape 方法中不需要为 label 增加图形，父类方法将会自动增加默认的 label，可以通过配置的方式指定 label 的位置和样式；

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