[stable32] fix(FloatingButtons): also hide when readonly, plaintext or richworkspace

[backportbot]

Backport of PR #7821

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.76%. Comparing base (808c940) to head (60815b7).
⚠️ Report is 4 commits behind head on stable32.

Additional details and impacted files

@@ Coverage Diff @@## stable32 #7828 +/- ##
============================================
+ Coverage 59.73% 59.76% +0.02% 
============================================
Files 499 499 Lines 38370 38398 +28 Branches 1061 1061 ============================================
+ Hits 22920 22948 +28 
Misses 15344 15344 Partials 106 106 

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