René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"More font rendering issues of mathtext","articleBody":"As noted by @zblz in #4873:\n\n\u003e Yes, the kerning for the f is particularly tight, but it is tight everywhere, as you mention for the\n\u003e regular f and numerals 2 and 9 (and that's why I added them to that line), so it is not an issue with\n\u003e the sub/super script. I tried to minimize it for cm, where it looks pretty good, but did not manage for\n\u003e stix of stixsans. Maybe the kerning for the f should be slightly widened elsewhere to match TeX. I\n\u003e added a modification of the superscript kerning that takes into account how much the last character \n\u003e rises above the x-height to try and mitigate this, but it is tricky: if it is correct for the italic f, it is too \n\u003e wide for,  e.g., $E^0$ (which is already slightly wider than tex), so I tried to reach a compromise.\n\u003e \n\u003e The prime issue only happens for stix and stixsans, where it seems to match $\\prime$ to an already \n\u003e superscripted prime, as opposed to a nice and big prime for TeX and cm. This I also believe is \n\u003e outside the scope of this PR, but should definitely be fixed so they are consistent.\n\nAll in reference to these images:\n![mathtex-cm](https://cloud.githubusercontent.com/assets/576258/9442585/84c6be8c-4a74-11e5-8bd6-bc194704c031.png)\n![LaTeX](https://cloud.githubusercontent.com/assets/576258/9442600/9de05234-4a74-11e5-91dc-7860b69000e5.png)\n![mathtext-stix](https://cloud.githubusercontent.com/assets/576258/9442615/b429872c-4a74-11e5-9328-8953bc3bb9f9.png)\n![mathtext-stixsans](https://cloud.githubusercontent.com/assets/576258/9442626/b9b7d28e-4a74-11e5-9054-91028a7c628d.png)\n","author":{"url":"https://github.com/WeatherGod","@type":"Person","name":"WeatherGod"},"datePublished":"2015-08-25T15:23:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/4987/matplotlib/issues/4987"}