add anchors to text box scroll bar

[MyreMylar]

fixes #502

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.25%. Comparing base (ffd548d) to head (e61dfc3).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #562      +/-   ##
==========================================
+ Coverage   96.17%   96.25%   +0.08%     
==========================================
  Files          88       88              
  Lines       12854    13242     +388     
==========================================
+ Hits        12362    12746     +384     
- Misses        492      496       +4     

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