Enable situate_axes in matplotlib for consistency

[philippjfr]

Very early on when implementing holoviews we added a situate_axes option which disables axis normalization for Raster and Image types in matplotlib. This pops up as a user question fairly frequently since it is inconsistent behavior.

Fixes: #692

[jlstevens]

Seems fine though maybe we should have a switch in hv.config for backwards compatibility? The failing tests indicate that changing this will affect the behavior of people's existing code.

[philippjfr]

I'm okay adding that but afaik hv.config is currently undocumented which means it might as well not exist.

[jlstevens]

The most important place to mention hv.config is in the compatibility section of the release notes, like we did for 1.8.0. And it is documented here.

[philippjfr]

Ah okay, great. So are we just going to add new keywords to the config argument like style_18? Doesn't seem quite right, since it isn't necessarily a style.

[jlstevens]

We can use any keywords we want in config and I imagine it would be something like config.situate_axes_18.

[philippjfr]

We can use any keywords we want in config and I imagine it would be something like config.situate_axes_18.

That seems pretty pointless imo, how would anyone discover that keyword exists? Seems easier to just have backward compatibility notice that says you can revert to hv.plotting.mpl.RasterPlot.situate_axes=False. I'm not against a style_18 flag or similar but I don't think every single tiny change should have its own entry in hv.config.

[jlstevens]

I'm not against a style_18 flag or similar but I don't think every single tiny change should have its own entry in hv.config.

I do agree but if there are enough changes then they should go in a hv.config flag.

[philippjfr]

I don't think this needs its own flag and I'm not aware of any other changes this could be grouped in with, so I'd prefer just to get this merged.

[jlstevens]

Ok. Though at the very least this will need to be mentioned wrt backwards compatibility in the new CHANGELOG.

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