Fix Collapse re-encoding content already managed by Toggler

[vjik]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Tests pass?	✔️
Fix #309

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (320c6a0) to head (7a92129).

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #310   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       712       712           
===========================================
  Files             22        22           
  Lines           2936      2931    -5     
===========================================
- Hits            2936      2931    -5     

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