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fix #8865: skip mixins and extends if child is already merged #8870

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merged 3 commits into from
Nov 30, 2018

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KaelWD
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@KaelWD KaelWD commented Sep 30, 2018

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

  • Bugfix
  • Feature
  • Code style update
  • Refactor
  • Build-related changes
  • Other, please describe:

Does this PR introduce a breaking change? (check one)

  • Yes
  • No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

If adding a new feature, the PR's description includes:

  • A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:
fixes #8865

@@ -379,10 +379,10 @@ export function mergeOptions (
normalizeInject(child, vm)
normalizeDirectives(child)
const extendsFrom = child.extends
if (extendsFrom) {
if (extendsFrom && !child._base) {
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Not sure if there's some other flag that's supposed to be used for this, but the presence of _base seemed like a decent indicator at a glance.

Co-Authored-By: KaelWD <[email protected]>
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Vue.extend causes nested mixins to be merged twice
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