Log-scale layout of heatmap bricks for log-scale axes (fixes #5991)

[andrew-matteson]

This fixes the heatmap brick layout identified in #5991 . The logic of make_bounds_array is extended with logic that replicates the linear scale logic in log space.

This PR fixes two problems in my use of the library:

1. Log-scale heatmaps would not render blocks that calculate a bound < 0.
2. Log-scale heatmaps would not have evenly sized blocks.

I've added a mock and baseline that behave correctly.

[andrew-matteson]

Bumping this @archmoj after the winter holiday. I'm hoping to get this into a near-term release for my team.

[andrew-matteson]

@archmoj Can you let me know anything that needs to happen to get this merged?

[archmoj]

Thanks for the fix. 🥇
Looking very good to me.
Over to @alexcjohnson

[alexcjohnson]

@archmoj after my two comments above this looks good. Thanks @andrew-matteson!

There's still an issue with histogram2d failing on log axes if the bins go past zero, but that's a trickier problem, we need to decide if the bins should also be spaced geometrically (and if so support binning that way) but that feels more like a new feature than a fix like the rest of this PR, since it will alter the data to be displayed, not just the details of how it's displayed - so it doesn't belong here - and is probably a much lower priority anyway, I don't think histogram2d gets a whole lot of use.

[andrew-matteson]

@alexcjohnson I think my fixes cover your cases. LMK if you have further thoughts.

[andrew-matteson]

There is a webgl-jasmine failure that I don't think is related to the recent changes. If it is, could you let me know what's going on? I can't quite deduce from the error messages.

[andrew-matteson]

@alexcjohnson I got the tests to rerun and they passed. LMK if this needs anything else.

[andrew-matteson]

@archmoj @alexcjohnson I'd love to get this in for an upcoming release my team has. Is there anything I need to do to wrap this up?

[archmoj]

Thanks very much for the fix.
💃
We are planning to have a minor plotly.js release next week which would include this.

[andrew-matteson]

Thank you! I appreciate this product so much :-)