fix: ensure DOM alterations during initialization are always cleaned up

[ghiscoding]

• this change was implemented in this SlickGrid PR and I'm not sure that it will make any differences in here since SlickGrid has its own (different) auto-resizer and part of the code doesn't exists in here (only a small portion of the code was copied over), so this change might or not help at all.

[stackblitz]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (b2f4f52) to head (0a1db9f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1751     +/-   ##
========================================
+ Coverage    99.8%   99.8%   +0.1%     
========================================
  Files         187     187             
  Lines       31119   31121      +2     
  Branches     9780    9780             
========================================
+ Hits        31030   31032      +2     
  Misses         89      89             

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