mapnik/mapnik — pull request #2519 by springmeyer (2014-10-10 22:19:25+00:00)
Title: use real max glyph height

- avoids breakage on fonts lacking an `X` glyph (#2506)
- avoids needing to create and mutate a temporary glyph (#2516)
- lots of minor visual changes - mostly improvements notably more correct collision boxes for lines with tall glyphs

too many minor visual tests for github's pull request viewer, so will update them incrementally in next commits.