Scan backwards to delete a word in a text field

[calixteman]

Finding the word to delete with a regex is quadratic in the value length, so each "delete word backward" keystroke could take a long time in a large field.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.00%. Comparing base (7fc7072) to head (08f6769).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21687   +/-   ##
=======================================
  Coverage   90.00%   90.00%           
=======================================
  Files         263      263           
  Lines       66854    66856    +2     
=======================================
+ Hits        60173    60177    +4     
+ Misses       6681     6679    -2     

Flag	Coverage Δ
browsertest	66.53% <0.00%> (-0.01%)	⬇️
fonttest	9.04% <ø> (ø)
integrationtest	69.37% <100.00%> (+0.01%)	⬆️
unittest	57.84% <0.00%> (+<0.01%)	⬆️
unittestcli	56.55% <0.00%> (-0.01%)	⬇️

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[timvandermeij]

Thank you for improving this!