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HexEditor: Size the offset area based on the text width
This gets rid of the last use of the offset_margin_width() magic number. I initially tried using `character_width() * 10` and found it was not accurate enough with between-character spacing, so instead this measures a specific string. All offset strings should be the same width in a fixed-width font.
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@ -110,9 +110,8 @@ private:
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size_t line_height() const { return font().pixel_size_rounded_up() + m_line_spacing; }
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size_t character_width() const { return font().glyph_fixed_width(); }
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size_t cell_width() const { return character_width() * 3; }
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size_t offset_margin_width() const { return 80; }
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int offset_area_width() const { return offset_margin_width() + m_padding; }
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int offset_area_width() const { return m_padding + font().width_rounded_up("0X12345678"sv) + m_padding; }
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int hex_area_width() const { return m_padding + m_bytes_per_row * cell_width() + m_padding; }
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int text_area_width() const { return m_padding + m_bytes_per_row * character_width() + m_padding; }
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