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Emoji characters are rendered as multiple replacement characters ('�') due to incomplete UTF-8 handling in syntax colorizer #171

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@shangyuan64

When inserting an emoji (e.g., 😀, 🌟) into the TextEditor, the character is displayed as several replacement glyphs (e.g., 3 or 4 consecutive �) instead of a single emoji.
This occurs only inside the editor; the same emoji renders correctly in standard ImGui::Text() calls, indicating that the font and ImGui configuration are correct.

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