Why is it that characters won’t line up with the ruler markings?
Ruler markings are spaced according to the font selected in Ruler Character Unit of the General tab in Preferences. If the font selected is, for example, Hiragino Kaku Gothic 12 with a base character of “あ”, then the ruler markings will be spaced according to the size of full-width characters in that font. If the font used is full-width Hiragino Kaku Gothic 12, then the characters will line up perfectly with the ruler markings, but if a different font is used they will not. In order for both half-width and full-width characters to line up with ruler markings, you must select a monospaced (fixed pitch) font such as Osaka Regular Mono. Proportional fonts (such as Hiragino Kaku Gothic) will match up with the ruler markings for full-width characters, but not for half-width characters. This is because the width of half-width characters depends on the individual character (m takes up more space than n).
