Import overlapping constituencies

[struan]

Fixes #337

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (50570ce) 82.93% compared to head (18dd032) 82.45%.

❗ Current head 18dd032 differs from pull request most recent head 34bff86. Consider uploading reports for the commit 34bff86 to get more accurate results

Files	Patch %	Lines
hub/views/area.py	20.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@                      Coverage Diff                      @@
##           multiple-geometry-staging     #345      +/-   ##
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- Coverage                      82.93%   82.45%   -0.48%     
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  Files                             92       93       +1     
  Lines                           2742     2753      +11     
  Branches                         279      281       +2     
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- Hits                            2274     2270       -4     
- Misses                           404      418      +14     
- Partials                          64       65       +1     

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[struan]

@zarino this is now ready to review

[zarino]

Looks good to me @struan. Can confirm the migration and import script worked for me in the Docker container, and things look right in the UI.

I’ve added a fixup commit that changes the markup a little in area.html – with fresh eyes, I was annoyed by how the table layout tended to break each constituency name onto two lines, and the text-muted paragraph after each constituency still felt too prominent. So I’ve gone with a grid layout now, which is optimised for 2–3 replacement constituencies but will handle more or fewer than that too. I’ve also tweaked the wording in the special case where a constituency is a straight 1-for-1 swap, now saying that the constituency is "replaced" rather than being "divided".