Report initial changed based on state, not expected properties

[Rich-Harris]

Fixes #1356

[codecov-io]

Codecov Report

Merging #1364 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1364      +/-   ##
==========================================
- Coverage   91.49%   91.49%   -0.01%     
==========================================
  Files         126      126              
  Lines        4468     4466       -2     
  Branches     1383     1382       -1     
==========================================
- Hits         4088     4086       -2     
  Misses        154      154              
  Partials      226      226

Impacted Files	Coverage Δ
src/shared/utils.js	100% <ø> (ø)	⬆️
src/generators/dom/index.ts	95.83% <100%> (-0.05%)	⬇️

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