fix: handle exceptions in selectionState clear method

[MinCrohn]

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[gemini-code-assist]

Summary of Changes

Hello @MinCrohn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a potential runtime error in the selection clearing logic by adding a defensive check. The change ensures that operations are only performed on valid, existing objects, thereby improving the robustness and stability of the selection state management.

Highlights

• Bug Fix: Implemented a check within the SelectionState's private #clear() method to ensure that the _selectionBox object is not destroyed before attempting to clear it. This prevents potential errors that could occur if the _selectionBox has already been deallocated or invalidated.

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[gemini-code-assist]

Code Review

This pull request correctly handles a potential exception in the SelectionState.clear method by adding a defensive check before calling _selectionBox.clear(). This prevents a runtime error that could occur when the state is destroyed. The fix is effective. For future consideration, the root cause appears to be the order of operations in the destroy method, where _selectionBox is destroyed before super.destroy() (which triggers the exit lifecycle). Reversing this order could provide a more robust lifecycle management and might make guards like this one unnecessary.