bug 1370514 - fixed links in editing mode

[karabellyj]

@jwhitlock r?

[codecov-io]

Codecov Report

Merging #4286 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4286      +/-   ##
==========================================
+ Coverage   87.83%   87.83%   +<.01%     
==========================================
  Files         162      162              
  Lines       10042    10045       +3     
  Branches     1371     1371              
==========================================
+ Hits         8820     8823       +3     
  Misses        993      993              
  Partials      229      229

Impacted Files	Coverage Δ
kuma/wiki/templatetags/jinja_helpers.py	88.52% <100%> (+0.38%)	⬆️
kuma/settings/common.py	94.28% <0%> (-0.03%)	⬇️

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[jwhitlock]

@karabellyj thanks for helping fix this!

There's a bug with wiki_url when passing a fragment like #The_attachments_box - it's adding it to the URL like MDN/Contribute/Editor/Basics%23The_attachments_box, which leads to creating a new page. This leads to creating a new page with the title "Basics%23The_attachments_box", not linking to that part of the page. I believe the redirect was somehow masking this bug.

I'm going to try to add a follow-on commit, so that we can fix both of these issues at the same time.

[jwhitlock]

Looks good. Thanks @karabellyj!