fix: context menu doesn't show up when the first paragraph is empty

[q200892907]

Closed #890

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.40%. Comparing base (b6bfd11) to head (f2913da).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
...bile_floating_toolbar/mobile_floating_toolbar.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #891      +/-   ##
==========================================
- Coverage   72.48%   72.40%   -0.08%     
==========================================
  Files         316      317       +1     
  Lines       14757    14785      +28     
==========================================
+ Hits        10696    10705       +9     
- Misses       4061     4080      +19     

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