Added regression tests for navigation

See the change to `_config.yml` for how to activate the tests.

docs/tests/navigation/order/mixture/-1.1.md

@@ -0,0 +1,16 @@
+---
+layout: default
+title: "-1.1"
+nav_order: -1.1
+parent: Mixture
+grand_parent: Order
+---
+
+# -1.1
+
+```yaml
+title: "-1.1"
+nav_order: -1.1
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/-1.md

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+---
+layout: default
+title: "-1"
+nav_order: -1
+parent: Mixture
+grand_parent: Order
+---
+
+# -1
+
+```yaml
+title: "-1"
+nav_order: -1
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/0.0.md

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+---
+layout: default
+title: "0.0"
+nav_order: 0.0
+parent: Mixture
+grand_parent: Order
+---
+
+# 0.0
+
+```yaml
+title: "0.0"
+nav_order: 0.0
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/0.md

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+---
+layout: default
+title: "0"
+nav_order: 0
+parent: Mixture
+grand_parent: Order
+---
+
+# 0
+
+```yaml
+title: "0"
+nav_order: 0
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/10.0.md

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+---
+layout: default
+title: "10.0"
+nav_order: 10.0
+parent: Mixture
+grand_parent: Order
+---
+
+# 10.0
+
+```yaml
+title: "10.0"
+nav_order: 10.0
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/10.md

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+---
+layout: default
+title: "10"
+parent: Mixture
+grand_parent: Order
+---
+
+# 10
+
+```yaml
+title: "10"
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/2.2222.md

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+---
+layout: default
+title: "2.2222"
+nav_order: 2.2222
+parent: Mixture
+grand_parent: Order
+---
+
+# 2.2222
+
+```yaml
+title: "2.2222"
+nav_order: 2.2222
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/2.md

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+---
+layout: default
+title: "2"
+parent: Mixture
+grand_parent: Order
+---
+
+# 2
+
+```yaml
+title: "2"
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/a.md

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+---
+layout: default
+title: A
+parent: Mixture
+grand_parent: Order
+---
+
+# A
+
+```yaml
+title: A
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/aa-lower.md

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+---
+layout: default
+title: aa
+nav_order: "aa"
+parent: Mixture
+grand_parent: Order
+---
+
+# aa
+
+```yaml
+title: aa
+nav_order: "aa"
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/aa.md

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+---
+layout: default
+title: Aa
+nav_order: "Aa"
+parent: Mixture
+grand_parent: Order
+---
+
+# Aa
+
+```yaml
+title: Aa
+nav_order: "Aa"
+parent: Mixture
+grand_parent: Order
+```

docs/tests/navigation/order/mixture/index.md

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+---
+layout: default
+title: Mixture
+parent: Order
+nav_order: 5
+has_children: true
+---
+
+# Mixed Order
+
+It seems unlikely that different types of `nav_order` values are needed for the children of the same parent.