Bugfix/issue 1189 inheritance state leak

[wisskid]

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[Copilot]

Pull request overview

Fixes Smarty inheritance state leaking across sequential {include} calls in a single render (issue #1189), where a child template’s {block} override could incorrectly affect a later, independent include of the parent template.

Changes:

• Adds a regression test (PHPUnit + fixtures) reproducing the “PARENT CHILD CHILD” leak and asserting “PARENT CHILD PARENT”.
• Adjusts InheritanceRuntime::init() to start a fresh inheritance root when entering a new top-level include after an inheritance tree has completed (based on state + empty block source stack).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/UnitTests/TemplateSource/_Issues/1189/templates/top.tpl	Repro template including parent → child(extends parent) → parent again.
tests/UnitTests/TemplateSource/_Issues/1189/templates/parent.tpl	Defines the parent {block} content (“PARENT”).
tests/UnitTests/TemplateSource/_Issues/1189/templates/child.tpl	Extends parent and overrides the {block} content (“CHILD”).
tests/UnitTests/TemplateSource/_Issues/1189/IncludeExtendsBlockLeakIssue1189Test.php	Regression test asserting the override does not leak into a later include.
src/Runtime/InheritanceRuntime.php	Updates inheritance initialization logic to prevent cross-include state leakage (issue #1189).

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