How do I get an extJS combo field to clear its 'value' when the display text is blank or doesn't match a list value, i.e. custom text not in the data store? I'm sure there must be something I'm missing, because such a simple feature can't make an otherwise impressive combo useless.How do I get an extJS combo field to clear its
阅读背景：
文本清除或不匹配时清除extJS组合值
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