Description

To keep the consistency between PuzzleEditorPanel and ProofEditorPanel. The onClearHistory() function for the former is implemented. Both functions could be called from the clear() function from the History class. However, at this point, the onClearHistory() function in the PuzzleEditorPanel class is not being used anywhere. This commit is made for future development.

Closes #479

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to an already existing feature)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

This function is not used, and it is not tested.

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes