Update for Wagtail 3.0

[nickmoreton]

Update for Wagtail v3.0

Following the release of Wagtail 3.0 this work implements the changes required for 3.0 compatibility and also maintains backwards compatibility to >= 2.15

• Testing
  • CI passes
  • If necessary, tests are added for new or fixed behaviour
  • These changes do not reduce test coverage
• Documentation.
  • This PR adds or updates documentation
  • Documentation changes are not necessary because:

I will be testing this on a live setup as well and will update here.

[codecov-commenter]

Codecov Report

Merging #157 (812df4c) into main (9b07de5) will decrease coverage by 0.49%.
The diff coverage is 74.28%.

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
- Coverage   65.05%   64.56%   -0.50%     
==========================================
  Files          32       28       -4     
  Lines        1265     1253      -12     
  Branches      228      203      -25     
==========================================
- Hits          823      809      -14     
+ Misses        400      398       -2     
- Partials       42       46       +4     

Impacted Files	Coverage Δ
wagtail_wordpress_import/block_builder_defaults.py	84.47% <ø> (ø)
...gtail_wordpress_import/handle_inline_shortcodes.py	88.23% <ø> (ø)
wagtail_wordpress_import/importers/apps.py	0.00% <ø> (ø)
...import/management/commands/analyze_html_content.py	0.00% <ø> (ø)
..._import/management/commands/analyze_xml_content.py	0.00% <0.00%> (ø)
...mport/management/commands/delete_imported_pages.py	0.00% <0.00%> (ø)
...wordpress_import/management/commands/import_xml.py	93.93% <ø> (+0.18%)	⬆️
...wordpress_import/management/commands/reduce_xml.py	33.33% <0.00%> (+1.02%)	⬆️
...gtail_wordpress_import/prefilters/bleach_filter.py	66.66% <ø> (-1.52%)	⬇️
...ordpress_import/prefilters/linebreaks_wp_filter.py	57.44% <ø> (ø)
... and 17 more

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[nickmoreton]

Hey @nimasmi Hope you don't mind me nudging about the review here. I'm thinking we'll need to get an update for Wagtail 4 soon 😄 Cheers

This can be useful to a quick spin up of the Wagtail 3 upgrade: https://github.com/nickmoreton/wwi-docker-develop/tree/test-wagtail-3.0

[nimasmi]

This looks great Nick.

Praise:

• adding the linters is a good step forward
• it looks like your multiple version support is neat and maintainable, and removable when we need to
• good effort including multiple version support in the documentation too

[nickmoreton]

Thanks @nimasmi for the code review.

I'll get this merged and release as soon as I can.