invites and readonly

[meejah]

Fixes #734

[codecov[bot]]

Codecov Report

Merging #736 (20f55f1) into main (8357f03) will decrease coverage by 0.06%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #736      +/-   ##
==========================================
- Coverage   91.90%   91.84%   -0.06%     
==========================================
  Files          38       38              
  Lines        5248     5251       +3     
  Branches      646      647       +1     
==========================================
  Hits         4823     4823              
- Misses        277      279       +2     
- Partials      148      149       +1     

Flag	Coverage Δ
integration	72.82% <0.00%> (-0.05%)	:arrow_down:

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Impacted Files	Coverage Δ
src/magic_folder/invite.py	91.54% <50.00%> (-0.28%)	:arrow_down:

... and 1 file with indirect coverage changes

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[meejah]

Local tools say there's a single uncovered line; no idea what codecov is doing here...