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heatmap bricks on log axes #5991

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From the discussion that came up in #5985 - that PR proposed 4 contour plots - on a mixture of log and linear axes - that should look identical but didn't, until fixed in the PR. If we make the same plots as a smoothed heatmap, they look identical as far as the smoothing goes, but we lose the first row of bricks on each log axis because its far edge would be at a negative coordinate:

Also closer to what we already do with smoothed heatmaps (the same mock after Plotly.restyle(gd,{'type':'heatmap', 'zsmooth':'best'}) - the four variants look slightly different but I think this is actually a symptom of some funny and potentially incorrect things we're doing with extending beyond the data values to make the outer edges of the heatmap bricks - we may want to adapt this for log axes too, especially as this results in us dropping the first row/column in this case!):
Screen Shot 2021-10-18 at 12 06 13 PM

Can we do a better job of picking brick edges in this case?

The figure above would be:

{
  "data": [
    {
      "x": [1,2,3,4,5],
      "y": [1,2,3,4,5],
      "z": [
        [0 ,   3.1250,   12.5000,   28.1250,   50.0000],
        [3.1250,    6.2500,   15.6250,   31.2500,   53.1250],
        [12.5000,   15.6250,   25.0000,   40.6250,   62.5000],
        [28.1250,   31.2500,   40.6250,   56.2500,   78.1250],
        [50.0000,   53.1250,   62.5000,   78.1250,  100.0000]
      ],
      "zsmooth": "best",
      "type": "heatmap"
    },
    {
      "x": [1,10,100,1000,10000],
      "y": [1,2,3,4,5],
      "z": [
        [0 ,   3.1250,   12.5000,   28.1250,   50.0000],
        [3.1250,    6.2500,   15.6250,   31.2500,   53.1250],
        [12.5000,   15.6250,   25.0000,   40.6250,   62.5000],
        [28.1250,   31.2500,   40.6250,   56.2500,   78.1250],
        [50.0000,   53.1250,   62.5000,   78.1250,  100.0000]
      ],
      "zsmooth": "best",
      "type": "heatmap",
      "showscale": false,
      "xaxis": "x2"
    },
    {
      "x": [1,2,3,4,5],
      "y": [1,10,100,1000,10000],
      "z": [
        [0 ,   3.1250,   12.5000,   28.1250,   50.0000],
        [3.1250,    6.2500,   15.6250,   31.2500,   53.1250],
        [12.5000,   15.6250,   25.0000,   40.6250,   62.5000],
        [28.1250,   31.2500,   40.6250,   56.2500,   78.1250],
        [50.0000,   53.1250,   62.5000,   78.1250,  100.0000]
      ],
      "zsmooth": "best",
      "type": "heatmap",
      "showscale": false,
      "yaxis": "y2"
    },
    {
      "x": [1,10,100,1000,10000],
      "y": [1,10,100,1000,10000],
      "z": [
        [0 ,   3.1250,   12.5000,   28.1250,   50.0000],
        [3.1250,    6.2500,   15.6250,   31.2500,   53.1250],
        [12.5000,   15.6250,   25.0000,   40.6250,   62.5000],
        [28.1250,   31.2500,   40.6250,   56.2500,   78.1250],
        [50.0000,   53.1250,   62.5000,   78.1250,  100.0000]
      ],
      "zsmooth": "best",
      "type": "heatmap",
      "showscale": false,
      "xaxis": "x2",
      "yaxis": "y2"
    }
  ],
  "layout": {
    "xaxis": {"domain": [0, 0.45]},
    "xaxis2": {"domain": [0.55, 1], "type": "log"},
    "yaxis": {"domain": [0, 0.45]},
    "yaxis2": {"domain": [0.55, 1], "type": "log"},
    "margin": {"l": 50, "b": 50, "r": 110, "t": 10},
    "width": 500,
    "height": 400
  }
}
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