Fixed #26402 -- Added relative path support in include/extends template tags.

tests/template_tests/relative_templates/dir1/dir2/inc1.html

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+{% include "./../../three.html" %}

tests/template_tests/relative_templates/dir1/dir2/inc2.html

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+{% include "./include_content.html" %}

tests/template_tests/relative_templates/dir1/dir2/include_content.html

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+dir2 include

tests/template_tests/relative_templates/dir1/dir2/one.html

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+{% extends "./../../one.html" %}
+
+{% block content %}{{ block.super }} dir2 one{% endblock %}

tests/template_tests/relative_templates/dir1/looped.html

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+{% extends "./dir2/../looped.html" %}
+
+{% block content %}{{ block.super }} dir1 three{% endblock %}

tests/template_tests/relative_templates/dir1/one.html

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+{% extends "./../one.html" %}
+
+{% block content %}{{ block.super }} dir1 one{% endblock %}

tests/template_tests/relative_templates/dir1/one1.html

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+{% extends './../one.html' %}
+
+{% block content %}{{ block.super }} dir1 one{% endblock %}

tests/template_tests/relative_templates/dir1/one2.html

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+{% extends '../one.html' %}
+
+{% block content %}{{ block.super }} dir1 one{% endblock %}

tests/template_tests/relative_templates/dir1/one3.html

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+{% extends "../one.html" %}
+
+{% block content %}{{ block.super }} dir1 one{% endblock %}

tests/template_tests/relative_templates/dir1/three.html

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+{% extends "./dir2/../../three.html" %}
+
+{% block content %}{{ block.super }} dir1 three{% endblock %}

tests/template_tests/relative_templates/dir1/two.html

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+{% extends "./dir2/one.html" %}
+
+{% block content %}{{ block.super }} dir1 two{% endblock %}

tests/template_tests/relative_templates/error_extends.html

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+{% extends "./../two.html" %}
+
+{% block content %}{{ block.super }} one{% endblock %}

tests/template_tests/relative_templates/error_include.html

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+{% include "./../three.html" %}

tests/template_tests/relative_templates/one.html

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+{% extends "./two.html" %}
+
+{% block content %}{{ block.super }} one{% endblock %}

tests/template_tests/relative_templates/three.html

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+{% block content %}three{% endblock %}

tests/template_tests/relative_templates/two.html

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+{% extends "./three.html" %}
+
+{% block content %}{{ block.super }} two{% endblock %}