FIX: contour sticky edges match dataLim

[rcomer]

Rationale

Fixes #2413. The problem seems to be that we have a very small mismatch between the artist's sticky edges and the axes dataLim. Within Matplotlib's contour code, these are set equal.

I have tested locally with both mpl nightly and mpl 3.8.4. Note that matplotlib/matplotlib#28393 was included in mpl 3.9.1 so our CI should already use the new version.

Implications

[greglucas]

Great job tracking this down! Thanks for the quick fix.

[greglucas]

@rcomer have you not signed the new CLA yet? I can't find a way to refresh that check now either...

[rcomer]

@rcomer have you not signed the new CLA yet? I can't find a way to refresh that check now either...

I got a pass from signing it as I'm publicly a member of the Met Office GitHub organisation. But the checker seems broken. @trexfeathers any ideas?

[trexfeathers]

You can recheck using this URL:

https://cla-assistant.io/check/SciTools/cartopy?pullRequest=2414

I have sometimes needed to try a couple of times when the service is patchy.

I'm keen to find a good place to share this information. Any thoughts would be welcomed. This could include a note in each repository if we can't think of a good central place

[greglucas]

@trexfeathers Is there a way to add that in the "Details" section? It was just stalled previously, so if there were a way to re-run it from this page directly that would be ideal. But a link somewhere else might be useful, although I'm guaranteed to forget about where that link is I'm sure ;)

[rcomer]

I'm guaranteed to forget about where that link is I'm sure ;)

I think @trexfeathers already had told me about it...

[trexfeathers]

@trexfeathers Is there a way to add that in the "Details" section? It was just stalled previously, so if there were a way to re-run it from this page directly that would be ideal. But a link somewhere else might be useful, although I'm guaranteed to forget about where that link is I'm sure ;)

Probably not, since at this point it hasn't run. All GitHub knows it should expect something with that name.

I got the URL from the comments that are posted when people still need to sign, so CLAAssistant are providing the information whenever they can. It's my fault for making it a required check.

This is the only place I can think of but that's very hidden at the point that a note would be needed:

cartopy/.github/PULL_REQUEST_TEMPLATE.md

Lines 31 to 35 in 11bb8d3

	* Note that you will automatically be asked to sign the
	[Contributor Licence Agreement](https://cla-assistant.io/SciTools/)
	(CLA), if you have not already done so.
	-->