It does not highlight the expression from left to right paranthesis.
So instead of:
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bind $txt <Double-1> {HighlightExpression %W }
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bind $txt <Double-1> {HighlightExpression %W; break }
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bind $txt <Double-1> {HighlightExpression %W }
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bind $txt <Double-1> {HighlightExpression %W; break }