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fix #10614: the select's v-model set to undefined in some corner case #10615

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fix(select-model): fix the issue of select's v-model set to undefined in some corner case
fix #10614

What kind of change does this PR introduce? (check at least one)

  • Bugfix
  • Feature
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  • Refactor
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@@ -118,7 +118,7 @@ function genSelect (
`.map(function(o){var val = "_value" in o ? o._value : o.value;` +
`return ${number ? '_n(val)' : 'val'}})`

const assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]'
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@xieranmaya xieranmaya Oct 10, 2019

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$$selectedVal may be an empty array, this way we should not return its first element
reserve the model's previous value is a reasonable choice

@despreston
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@xieranmaya I'd like to get a fix for this bug into the next release. Do you mind if I open a PR off this branch that will fix this failing test?

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when <select> model and the option list changed at the same time, model may incorrectly set to undefined
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