About auto-closing issues
By default, merging a linked pull request automatically closes the associated issue. You can override the default behavior by disabling auto-closing.
Enabling or disabling auto-closing of issues
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在 GitHub 上，导航到存储库的主页面。
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在存储库名称下，单击 “设置”。 如果看不到“设置”选项卡，请选择“”下拉菜单，然后单击“设置”。
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Under General, scroll down to the Issues section.
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Select or deselect Auto-close issues with merged linked pull requests to enable or disable auto-closing.
