With higher values of 'calc-string-maximum-character', rules made up of glyphs of non-unit width can be the wrong length. Calculate the number of characters in the rule based on the display width, rounded up to the nearest integer. Refines feature introduced in bug#78528. * lisp/calc/calccomp.el (math-comp-simplify-term): Calculate rule width with a ratio of 'string-pixel-width's.