[#6475] Whenever an iframe changes location Hypothesis needs to be injected again

[jwgmeligmeyling]

When enabling annotations on an iframe with the enable-annotation attribute, it appears the client is only injected once. This leads to issues when the frame navigates to another page. I haven't checked whether the issue exists for all types of navigation (for example if it matters if the parent or the frame itself is causing the navigation). In this particular case the frame was initialised with about:blank.

I have found that reattaching the frame on the load event on the frame solves the issue. I am open for better suggestions fixing this.

Fixes #6475

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.44%. Comparing base (f4e5e98) to head (9e3cc94).
Report is 163 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6476      +/-   ##
==========================================
+ Coverage   99.43%   99.44%   +0.01%     
==========================================
  Files         271      270       -1     
  Lines       10238    10444     +206     
  Branches     2425     2489      +64     
==========================================
+ Hits        10180    10386     +206     
  Misses         58       58              

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