René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"heatmap ordering bug","articleBody":"Heatmaps have a similar issue to one that was fixed for contour maps in #2891 - ordering gets messed up if you hide and reshow traces. See https://codepen.io/alexcjohnson/pen/OwYrKg - initially electric is in front as it should be:\r\n![screen shot 2018-08-15 at 3 44 19 pm](https://user-images.githubusercontent.com/2678795/44169359-26267200-a0a2-11e8-8335-a63f8323d814.png)\r\nBut if you click \"Hide \u0026 Show Trace 0\" then Greys is in front:\r\n![screen shot 2018-08-15 at 3 45 41 pm](https://user-images.githubusercontent.com/2678795/44169403-4fdf9900-a0a2-11e8-8cec-6b2c06483b33.png)\r\n\"Hide \u0026 Show Trace 1\" will bring electric back to the front.\r\n\r\nSee https://github.com/plotly/plotly.js/pull/2891/commits/597a845428ce57d4020bb8d7a0bd11e9d48bde10#r209345643 - Should be just a matter of replicating https://github.com/plotly/plotly.js/pull/2891/commits/597a845428ce57d4020bb8d7a0bd11e9d48bde10 for `heatmap` - and probably for `carpet` too, though it's probably unintended anyway if carpets overlap each other!","author":{"url":"https://github.com/alexcjohnson","@type":"Person","name":"alexcjohnson"},"datePublished":"2018-08-15T19:51:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/2907/plotly.js/issues/2907"}