perf: don't invalidate grid rows more than once, fixes #1678

[ghiscoding]

fixes #1678

• see this comment for more details

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (ac7e6f9) to head (c01164c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1680     +/-   ##
========================================
+ Coverage    99.8%   99.8%   +0.1%     
========================================
  Files         187     187             
  Lines       31087   31090      +3     
  Branches     9784    9785      +1     
========================================
+ Hits        30998   31001      +3     
  Misses         89      89             

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