Comment 3 for bug 839189

So the problem is only limited to LCD subpixel aliasing, when I select the antialiasing type of "best contrast", "best shapes" or "monochrome", tilde remains a tilde. All these antialising however cause huge variations in the font widths and kerning, as well as causing perceived emboldening at the 12→13pt switch. Subpixel antialiasing produces fonts that are visually consistent across point sizes, but clearly does something too eagerly to the tilde.