fix: avoid adding a new declaration when finish editing existing style

[ktsn]

No description provided.

[codecov]

Codecov Report

Merging #21 into master will decrease coverage by 0.44%.
The diff coverage is 21.42%.

@@            Coverage Diff            @@
##           master     #21      +/-   ##
=========================================
- Coverage   64.64%   64.2%   -0.45%     
=========================================
  Files          44      44              
  Lines        1355    1369      +14     
  Branches      324     315       -9     
=========================================
+ Hits          876     879       +3     
- Misses        464     475      +11     
  Partials       15      15

Impacted Files	Coverage Δ
src/view/components/StyleInformation.vue	0% <0%> (ø)	⬆️
src/view/components/StyleValue.vue	100% <100%> (ø)	⬆️
src/view/components/StyleDeclaration.vue	100% <100%> (ø)	⬆️

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