Make cell width better adjust to characters
@behdad
Submitted by Behdad Esfahbod Link to original bug (#329481)
Description
With Pango HEAD, the cairo backend draws hex boxes with one row of digits, if the font size is < 10. In that case, the char boxes in gucharmap are too narrow and the hex boxes overlap. There are 4-digit and 6-digit single-row hex boxes.