Fix inverted condition check for LinkedListItems in NatVis

[WardenGnaw]

The condition guard was using IsNullOrWhiteSpace instead of !IsNullOrWhiteSpace, which meant LinkedListItems with a Condition attribute were never filtered, items were always shown regardless of the condition value.

Added an integration test (TestLinkedListItemsCondition) that creates two ConditionalLinkedList objects, one with isActive=true and one with isActive=false, and verifies that the NatVis LinkedListItems Condition attribute is respected.

[Copilot]

Pull request overview

This PR fixes an inverted condition check in the NatVis LinkedListItems handler in Natvis.cs. Previously, String.IsNullOrWhiteSpace(item.Condition) caused the condition evaluation to be skipped whenever a Condition attribute was present, so LinkedListItems were always shown regardless of the condition. The fix inverts the check so the condition is evaluated only when it is non-empty, matching the typical pattern used elsewhere. A new integration test and supporting debuggee artifacts (C++ class + Natvis type) are added to validate both true/false Condition cases.

Changes:

• Invert the IsNullOrWhiteSpace guard so LinkedListItems Condition is actually evaluated.
• Add ConditionalLinkedList C++ debuggee class and a corresponding <Type> definition in Simple.natvis using LinkedListItems Condition="isActive".
• Add TestLinkedListItemsCondition integration test and update SimpleClassAssignmentLine/ReturnSourceLine constants to reflect new line numbers in main.cpp.

Show a summary per file

File	Description
src/MIDebugEngine/Natvis.Impl/Natvis.cs	Fixes inverted IsNullOrWhiteSpace check so LinkedListItems Condition is evaluated when present.
test/CppTests/Tests/NatvisTests.cs	Updates line-number constants and adds TestLinkedListItemsCondition integration test.
test/CppTests/debuggees/natvis/src/visualizer_files/Simple.natvis	Adds ConditionalLinkedList visualizer with LinkedListItems Condition="isActive".
test/CppTests/debuggees/natvis/src/main.cpp	Instantiates active/inactive ConditionalLinkedList instances before the return for inspection.
test/CppTests/debuggees/natvis/src/ConditionalLinkedList.h	New C++ singly-linked list class used by the new test.

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• Files reviewed: 5/5 changed files
• Comments generated: 0